### Start HTTPS Server

Source: https://prometheus.github.io/client_python/exporting/http

Starts an HTTPS server by providing the required certificate and key files.

```python
from prometheus_client import start_http_server

start_http_server(8000, certfile="server.crt", keyfile="server.key")
```

--------------------------------

### Real-world Application Metadata Example

Source: https://prometheus.github.io/client_python/instrumenting/info

Full example demonstrating how to expose build metadata via an HTTP server.

```python
from prometheus_client import Info, start_http_server

BUILD_INFO = Info(
    'build',
    'Application build information',
    namespace='myapp',
)

BUILD_INFO.info({
    'version': '1.4.2',
    'revision': 'abc123def456',
    'branch': 'main',
    'build_date': '2024-01-15',
})

if __name__ == '__main__':
    start_http_server(8000)  # exposes metrics at http://localhost:8000/metrics
    # ... start your application ...
```

--------------------------------

### Real-world Gauge Example

Source: https://prometheus.github.io/client_python/instrumenting/gauge

Complete example demonstrating active connection tracking and queue size monitoring.

```python
from prometheus_client import Gauge, start_http_server

ACTIVE_CONNECTIONS = Gauge(
    'connections_active',
    'Number of active database connections',
    namespace='myapp',
)
QUEUE_SIZE = Gauge(
    'job_queue_size',
    'Number of jobs waiting in the queue',
    namespace='myapp',
)

job_queue = []
QUEUE_SIZE.set_function(lambda: len(job_queue))

def acquire_connection():
    ACTIVE_CONNECTIONS.inc()

def release_connection():
    ACTIVE_CONNECTIONS.dec()

if __name__ == '__main__':
    start_http_server(8000)  # exposes metrics at http://localhost:8000/metrics
    # ... start your application ...
```

--------------------------------

### Install Prometheus Python Client

Source: https://prometheus.github.io/client_python

Use pip to install the required library for Prometheus metrics instrumentation.

```bash
pip install prometheus-client
```

--------------------------------

### Instrument Python Application

Source: https://prometheus.github.io/client_python

Example of creating a Summary metric, decorating a function to track execution time, and starting an HTTP server to expose metrics on port 8000.

```python
from prometheus_client import start_http_server, Summary
import random
import time

# Create a metric to track time spent and requests made.
REQUEST_TIME = Summary('request_processing_seconds', 'Time spent processing request')

# Decorate function with metric.
@REQUEST_TIME.time()
def process_request(t):
    """A dummy function that takes some time."""
    time.sleep(t)

if __name__ == '__main__':
    # Start up the server to expose the metrics.
    start_http_server(8000)
    # Generate some requests.
    while True:
        process_request(random.random())
```

--------------------------------

### Run Flask Application with uWSGI

Source: https://prometheus.github.io/client_python/exporting/http/flask

Commands to install uWSGI and serve the Flask application.

```bash
# Install uwsgi if you do not have it
pip install uwsgi
uwsgi --http 127.0.0.1:8000 --wsgi-file myapp.py --callable app
```

--------------------------------

### start_wsgi_server

Source: https://prometheus.github.io/client_python/exporting/http/wsgi

Starts a WSGI server in a new thread to serve Prometheus metrics.

```APIDOC
## start_wsgi_server(port)

### Description
Starts a WSGI server using the reference implementation in a new thread to serve metrics on the specified port.

### Parameters
- **port** (int) - Required - The port number to bind the server to.

### Example
```python
from prometheus_client import start_wsgi_server

start_wsgi_server(8000)
```
```

--------------------------------

### Start HTTP Server

Source: https://prometheus.github.io/client_python/exporting/http

Starts a daemon thread HTTP server on the specified port to expose metrics.

```python
from prometheus_client import start_http_server

start_http_server(8000)
```

--------------------------------

### Add Summary Metrics

Source: https://prometheus.github.io/client_python/collector/custom

Example of adding labelled samples to a SummaryMetricFamily.

```python
s = SummaryMetricFamily('rpc_duration_seconds', 'RPC duration', labels=['method'])
s.add_metric(['get'], count_value=1000, sum_value=53.2)
s.add_metric(['put'], count_value=400, sum_value=28.7)
yield s
```

--------------------------------

### Metric Name Construction

Source: https://prometheus.github.io/client_python/instrumenting/info

Example showing how namespace, subsystem, and name parameters combine to form the final metric name.

```python
# namespace='myapp', subsystem='http', name='build'
# produces: myapp_http_build_info
Info('build', 'Build information', namespace='myapp', subsystem='http')
```

--------------------------------

### Add Counter Metrics

Source: https://prometheus.github.io/client_python/collector/custom

Example of adding labelled samples to a CounterMetricFamily.

```python
c = CounterMetricFamily('http_requests_total', 'HTTP requests by status', labels=['status'])
c.add_metric(['200'], 1200)
c.add_metric(['404'], 43)
c.add_metric(['500'], 7)
yield c
```

--------------------------------

### Track Background Task Duration

Source: https://prometheus.github.io/client_python/instrumenting/summary

A complete example showing how to use labels and the time() context manager for background tasks.

```python
from prometheus_client import Summary, start_http_server

TASK_DURATION = Summary(
    'task_duration_seconds',
    'Time spent processing background tasks',
    labelnames=['task_type'],
    namespace='myapp',
)

def run_task(task_type, task):
    with TASK_DURATION.labels(task_type=task_type).time():
        # ... run the task ...
        pass

if __name__ == '__main__':
    start_http_server(8000)  # exposes metrics at http://localhost:8000/metrics
    # ... start your application ...
```

--------------------------------

### Add Gauge Metrics

Source: https://prometheus.github.io/client_python/collector/custom

Example of adding labelled samples to a GaugeMetricFamily.

```python
g = GaugeMetricFamily('temperature_celsius', 'Temperature by location', labels=['location'])
g.add_metric(['living_room'], 21.5)
g.add_metric(['basement'], 18.0)
yield g
```

--------------------------------

### Create labelled InfoMetricFamily

Source: https://prometheus.github.io/client_python/collector/custom

Example of creating a labelled info metric and adding multiple service-specific entries.

```python
i = InfoMetricFamily('service_build', 'Per-service build info', labels=['service'])
i.add_metric(['auth'], {'version': '2.0.1', 'commit': 'def456'})
i.add_metric(['api'], {'version': '1.9.0', 'commit': 'ghi789'})
yield i
```

--------------------------------

### GET (any)

Source: https://prometheus.github.io/client_python/exporting/http

Returns HTTP status 200 and the metrics data.

```APIDOC
## GET (any)

### Description
Returns HTTP status 200 and the metrics data.

### Method
GET

### Endpoint
(any)
```

--------------------------------

### Real-world Histogram Implementation

Source: https://prometheus.github.io/client_python/instrumenting/histogram

Full example of tracking HTTP request latency with labels and custom buckets.

```python
from prometheus_client import Histogram, start_http_server

REQUEST_LATENCY = Histogram(
    'request_duration_seconds',
    'HTTP request latency',
    labelnames=['method', 'endpoint'],
    namespace='myapp',
    buckets=[.01, .05, .1, .25, .5, 1, 2.5, 5],
)

def handle_request(method, endpoint):
    with REQUEST_LATENCY.labels(method=method, endpoint=endpoint).time():
        # ... handle the request ...
        pass

if __name__ == '__main__':
    start_http_server(8000)  # exposes metrics at http://localhost:8000/metrics
    # ... start your application ...
```

--------------------------------

### OPTIONS (any)

Source: https://prometheus.github.io/client_python/exporting/http

Returns HTTP status 200 and an 'Allow' header indicating the allowed methods (OPTIONS, GET).

```APIDOC
## OPTIONS (any)

### Description
Returns HTTP status 200 and an 'Allow' header indicating the allowed methods (OPTIONS, GET).

### Method
OPTIONS

### Endpoint
(any)
```

--------------------------------

### Start a WSGI server in a new thread

Source: https://prometheus.github.io/client_python/exporting/http/wsgi

Serves metrics through the WSGI reference implementation in a background thread.

```python
from prometheus_client import start_wsgi_server

start_wsgi_server(8000)
```

--------------------------------

### Create unlabelled InfoMetricFamily

Source: https://prometheus.github.io/client_python/collector/custom

Example of yielding a single unlabelled info metric with key-value pairs.

```python
yield InfoMetricFamily('build', 'Build metadata', value={'version': '1.2.3', 'commit': 'abc123'})
```

--------------------------------

### Running FastAPI with Gunicorn

Source: https://prometheus.github.io/client_python/exporting/http/fastapi-gunicorn

Command to start the FastAPI application using the Uvicorn worker class for Gunicorn.

```bash
# Install gunicorn if you do not have it
pip install gunicorn
# If using multiple workers, add `--workers n` parameter to the line below
gunicorn -b 127.0.0.1:8000 myapp:app -k uvicorn.workers.UvicornWorker
```

--------------------------------

### Track background worker lifecycle

Source: https://prometheus.github.io/client_python/instrumenting/enum

A complete example demonstrating how to track the state of a background worker process.

```python
from prometheus_client import Enum, start_http_server

WORKER_STATE = Enum(
    'worker_state',
    'Current state of the background worker',
    states=['idle', 'running', 'error'],
    namespace='myapp',
)

def process_job():
    WORKER_STATE.state('running')
    try:
        # ... do work ...
        pass
    except Exception:
        WORKER_STATE.state('error')
        raise
    finally:
        WORKER_STATE.state('idle')

if __name__ == '__main__':
    start_http_server(8000)  # exposes metrics at http://localhost:8000/metrics
    # ... start your application ...
```

--------------------------------

### Track HTTP requests with labels

Source: https://prometheus.github.io/client_python/instrumenting/counter

Real-world example demonstrating how to use labels with Counters to track HTTP requests and exceptions.

```python
from prometheus_client import Counter, start_http_server

REQUESTS = Counter(
    'requests_total',
    'Total HTTP requests received',
    labelnames=['method', 'status'],
    namespace='myapp',
)
EXCEPTIONS = Counter(
    'exceptions_total',
    'Total unhandled exceptions',
    labelnames=['handler'],
    namespace='myapp',
)

def handle_request(method, handler):
    with EXCEPTIONS.labels(handler=handler).count_exceptions():
        # ... process the request ...
        status = '200'
    REQUESTS.labels(method=method, status=status).inc()

if __name__ == '__main__':
    start_http_server(8000)  # exposes metrics at http://localhost:8000/metrics
    # ... start your application ...
```

--------------------------------

### Add metrics to HistogramMetricFamily

Source: https://prometheus.github.io/client_python/collector/custom

Example of creating a labelled histogram and adding metric data points.

```python
h = HistogramMetricFamily('request_size_bytes', 'Request sizes', labels=['handler'])
h.add_metric(
    ['api'],
    buckets=[('100', 5), ('1000', 42), ('+Inf', 50)],
    sum_value=18350.0,
)
yield h
```

--------------------------------

### Get target info labels

Source: https://prometheus.github.io/client_python/registry

Retrieves the current target metadata labels.

```python
info = REGISTRY.get_target_info()
```

--------------------------------

### HTTP Error Response Example

Source: https://prometheus.github.io/client_python/exporting/http

Shows the format of an HTTP error response returned by the client.

```text
# HTTP 405 Method Not Allowed: XXX; use OPTIONS or GET
```

--------------------------------

### Summary Metric Output Format

Source: https://prometheus.github.io/client_python/instrumenting/summary

Example of the time series data produced by a Summary metric.

```text
myapp_task_duration_seconds_count{task_type="email"} 120
myapp_task_duration_seconds_sum{task_type="email"} 48.3
```

--------------------------------

### Example restricted output

Source: https://prometheus.github.io/client_python/restricted-registry

The resulting output format when a registry is restricted to specific metrics.

```text
# HELP python_info Python platform information
# TYPE python_info gauge
python_info{implementation="CPython",major="3",minor="9",patchlevel="3",version="3.9.3"} 1.0
# HELP python_gc_objects_collected_total Objects collected during gc
# TYPE python_gc_objects_collected_total counter
python_gc_objects_collected_total{generation="0"} 73129.0
python_gc_objects_collected_total{generation="1"} 8594.0
python_gc_objects_collected_total{generation="2"} 296.0
```

--------------------------------

### Enum naming convention

Source: https://prometheus.github.io/client_python/instrumenting/enum

Example of how namespace, subsystem, and name parameters combine to form the final metric name.

```python
# namespace='myapp', subsystem='worker', name='state'
# produces: myapp_worker_state
Enum('state', 'Worker state', states=['idle', 'running', 'error'], namespace='myapp', subsystem='worker')
```

--------------------------------

### Histogram Output Format

Source: https://prometheus.github.io/client_python/instrumenting/histogram

Example of the time series generated by a histogram with labels.

```text
myapp_request_duration_seconds_bucket{method="GET",endpoint="/api/users",le="0.1"} 42
myapp_request_duration_seconds_sum{method="GET",endpoint="/api/users"} 3.7
myapp_request_duration_seconds_count{method="GET",endpoint="/api/users"} 50
```

--------------------------------

### GET /favicon.ico

Source: https://prometheus.github.io/client_python/exporting/http

Returns HTTP status 200 and an empty response body.

```APIDOC
## GET /favicon.ico

### Description
Returns HTTP status 200 and an empty response body. Some browsers support this to display the returned icon in the browser tab.

### Method
GET

### Endpoint
/favicon.ico
```

--------------------------------

### Get sample value for testing

Source: https://prometheus.github.io/client_python/registry

Retrieves the current value of a specific metric sample, primarily for unit testing.

```python
from prometheus_client import Counter, CollectorRegistry

r = CollectorRegistry()
c = Counter('requests_total', 'Total requests', registry=r)
c.inc(3)

assert r.get_sample_value('requests_total') == 3.0
```

--------------------------------

### Initialize and Observe a Summary

Source: https://prometheus.github.io/client_python/instrumenting/summary

Create a Summary metric and record observations using the observe method.

```python
from prometheus_client import Summary
s = Summary('request_latency_seconds', 'Description of summary')
s.observe(4.7)    # Observe 4.7 (seconds in this case)
```

--------------------------------

### Define Summary with Namespace and Subsystem

Source: https://prometheus.github.io/client_python/instrumenting/summary

Demonstrates how namespace, subsystem, and name parameters combine to form the full metric name.

```python
# namespace='myapp', subsystem='worker', name='task_duration_seconds'
# produces: myapp_worker_task_duration_seconds
Summary('task_duration_seconds', 'Task duration', namespace='myapp', subsystem='worker')
```

--------------------------------

### Create an ASGI application for Prometheus metrics

Source: https://prometheus.github.io/client_python/exporting/http/asgi

Initializes a basic ASGI application to serve Prometheus metrics.

```python
from prometheus_client import make_asgi_app

app = make_asgi_app()
```

--------------------------------

### Initialize SummaryMetricFamily

Source: https://prometheus.github.io/client_python/collector/custom

Constructor signature for SummaryMetricFamily.

```python
SummaryMetricFamily(name, documentation, count_value=None, sum_value=None, labels=None, unit='')
```

--------------------------------

### Initialize InfoMetricFamily

Source: https://prometheus.github.io/client_python/collector/custom

Constructor signature for creating a new Info metric family.

```python
InfoMetricFamily(name, documentation, value=None, labels=None)
```

--------------------------------

### Create a WSGI application for metrics

Source: https://prometheus.github.io/client_python/exporting/http/wsgi

Uses make_wsgi_app to generate a WSGI app and serves it using wsgiref.simple_server.

```python
from prometheus_client import make_wsgi_app
from wsgiref.simple_server import make_server

app = make_wsgi_app()
httpd = make_server('', 8000, app)
httpd.serve_forever()
```

--------------------------------

### Initialize CounterMetricFamily

Source: https://prometheus.github.io/client_python/collector/custom

Constructor signature for CounterMetricFamily.

```python
CounterMetricFamily(name, documentation, value=None, labels=None, created=None, unit='', exemplar=None)
```

--------------------------------

### Info(name, documentation, labelnames=(), namespace='', subsystem='', unit='', registry=REGISTRY)

Source: https://prometheus.github.io/client_python/instrumenting/info

Constructor for creating an Info metric instance.

```APIDOC
## Constructor: Info

### Description
Initializes a new Info metric. A '_info' suffix is automatically appended to the metric name.

### Parameters
- **name** (str) - Required - Metric name.
- **documentation** (str) - Required - Help text for the metric.
- **labelnames** (Iterable[str]) - Optional - Names of labels for this metric.
- **namespace** (str) - Optional - Optional prefix.
- **subsystem** (str) - Optional - Optional middle component.
- **unit** (str) - Optional - Not supported; raises ValueError.
- **registry** (CollectorRegistry) - Optional - Registry to register with.
```

--------------------------------

### Initialize CollectorRegistry constructor

Source: https://prometheus.github.io/client_python/registry

Shows the signature for creating a new CollectorRegistry instance.

```python
CollectorRegistry(auto_describe=False, target_info=None, support_collectors_without_names=False)
```

--------------------------------

### Global REGISTRY initialization

Source: https://prometheus.github.io/client_python/registry

Shows how the default global REGISTRY instance is initialized.

```python
REGISTRY = CollectorRegistry(auto_describe=True)
```

--------------------------------

### Summary(name, documentation, labelnames=(), namespace='', subsystem='', unit='', registry=REGISTRY)

Source: https://prometheus.github.io/client_python/instrumenting/summary

Constructor for creating a new Summary metric instance.

```APIDOC
## Summary Constructor

### Description
Creates a new Summary metric to track observations. The full metric name is formed by joining namespace, subsystem, and name with underscores.

### Parameters
- **name** (str) - Required - Metric name.
- **documentation** (str) - Required - Help text shown in the /metrics output.
- **labelnames** (Iterable[str]) - Optional - Names of labels for this metric.
- **namespace** (str) - Optional - Optional prefix.
- **subsystem** (str) - Optional - Optional middle component.
- **unit** (str) - Optional - Optional unit suffix.
- **registry** (CollectorRegistry) - Optional - Registry to register with.
```

--------------------------------

### Using instance IP grouping key

Source: https://prometheus.github.io/client_python/exporting/pushgateway

Automatically set the instance label to the host's IP address using the instance_ip_grouping_key helper.

```python
from prometheus_client.exposition import instance_ip_grouping_key

push_to_gateway('localhost:9091', job='batchA', registry=registry,
                grouping_key=instance_ip_grouping_key())
```

--------------------------------

### Initialize GaugeMetricFamily

Source: https://prometheus.github.io/client_python/collector/custom

Constructor signature for GaugeMetricFamily.

```python
GaugeMetricFamily(name, documentation, value=None, labels=None, unit='')
```

--------------------------------

### Initialize and use CollectorRegistry

Source: https://prometheus.github.io/client_python/registry

Demonstrates using the default global registry versus creating an isolated registry for testing purposes.

```python
from prometheus_client import REGISTRY, CollectorRegistry

# Use the default global registry
from prometheus_client import Counter
c = Counter('my_counter', 'A counter')  # registered with REGISTRY automatically

# Create an isolated registry, e.g. for testing
r = CollectorRegistry()
c2 = Counter('my_counter', 'A counter', registry=r)
```

--------------------------------

### Construct Counter with namespace and subsystem

Source: https://prometheus.github.io/client_python/instrumenting/counter

Demonstrates how namespace, subsystem, and name parameters are combined into the final metric name.

```python
# namespace='myapp', subsystem='http', name='requests_total'
# produces: myapp_http_requests_total
Counter('requests_total', 'Total requests', namespace='myapp', subsystem='http')
```

--------------------------------

### Export metrics to a text file

Source: https://prometheus.github.io/client_python/exporting/textfile

Demonstrates creating a custom registry and writing metrics to a file for the Node exporter to collect.

```python
from prometheus_client import CollectorRegistry, Gauge, write_to_textfile

registry = CollectorRegistry()
g = Gauge('raid_status', '1 if raid array is okay', registry=registry)
g.set(1)
write_to_textfile('/configured/textfile/path/raid.prom', registry)
```

--------------------------------

### Basic Info Metric Usage

Source: https://prometheus.github.io/client_python/instrumenting/info

Initialize an Info metric and set its key-value pairs.

```python
from prometheus_client import Info
i = Info('my_build_version', 'Description of info')
i.info({'version': '1.2.3', 'buildhost': 'foo@bar'})
```

--------------------------------

### make_asgi_app

Source: https://prometheus.github.io/client_python/exporting/http/asgi

Creates an ASGI application to serve Prometheus metrics.

```APIDOC
## make_asgi_app

### Description
Creates an ASGI application that exposes Prometheus metrics. This application can be integrated into existing ASGI frameworks.

### Parameters
- **disable_compression** (bool) - Optional - If set to True, disables Gzip compression of the response even if the client sends an Accept-Encoding: gzip header. Defaults to False.

### Usage Example
```python
from prometheus_client import make_asgi_app

# Basic usage
app = make_asgi_app()

# Usage with compression disabled
app = make_asgi_app(disable_compression=True)
```
```

--------------------------------

### Summary Constructor Signature

Source: https://prometheus.github.io/client_python/instrumenting/summary

The signature for initializing a new Summary metric.

```python
Summary(name, documentation, labelnames=(), namespace='', subsystem='', unit='', registry=REGISTRY)
```

--------------------------------

### Shutdown HTTP Server

Source: https://prometheus.github.io/client_python/exporting/http

Demonstrates how to gracefully shut down the server and join the daemon thread.

```python
server, t = start_http_server(8000)
server.shutdown()
server.server_close()
t.join()
```

--------------------------------

### Constructing GaugeMetricFamily with inline or labelled data

Source: https://prometheus.github.io/client_python/collector/custom

Demonstrates initializing a GaugeMetricFamily with a single unlabelled value versus using labels to add multiple metrics.

```python
# single unlabelled value
GaugeMetricFamily('my_gauge', 'Help text', value=7)

# labelled metrics via add_metric
g = GaugeMetricFamily('my_gauge', 'Help text', labels=['region'])
g.add_metric(['us-east-1'], 3)
g.add_metric(['eu-west-1'], 5)
```

--------------------------------

### Initialize HistogramMetricFamily

Source: https://prometheus.github.io/client_python/collector/custom

Constructor signature for creating a new Histogram metric family.

```python
HistogramMetricFamily(name, documentation, buckets=None, sum_value=None, labels=None, unit='')
```

--------------------------------

### Register a custom collector

Source: https://prometheus.github.io/client_python/registry

Shows how to implement and register a custom collector class.

```python
from prometheus_client.registry import Collector

class MyCollector(Collector):
    def collect(self):
        ...

REGISTRY.register(MyCollector())
```

--------------------------------

### Basic Histogram Usage

Source: https://prometheus.github.io/client_python/instrumenting/histogram

Initialize a histogram and record an observation.

```python
from prometheus_client import Histogram
h = Histogram('request_latency_seconds', 'Description of histogram')
h.observe(4.7)    # Observe 4.7 (seconds in this case)
```

--------------------------------

### make_wsgi_app

Source: https://prometheus.github.io/client_python/exporting/http/wsgi

Creates a WSGI application that serves Prometheus metrics. This can be integrated into existing WSGI servers.

```APIDOC
## make_wsgi_app(disable_compression=False)

### Description
Creates a WSGI application to serve Prometheus metrics. By default, it supports Gzip compression if requested by the client.

### Parameters
- **disable_compression** (bool) - Optional - If set to True, disables Gzip compression for the response.

### Example
```python
from prometheus_client import make_wsgi_app
from wsgiref.simple_server import make_server

app = make_wsgi_app(disable_compression=True)
httpd = make_server('', 8000, app)
httpd.serve_forever()
```
```

--------------------------------

### CollectorRegistry Constructor

Source: https://prometheus.github.io/client_python/registry

Initializes a new CollectorRegistry instance.

```APIDOC
## CollectorRegistry(auto_describe=False, target_info=None, support_collectors_without_names=False)

### Description
Creates a new registry instance to hold collectors.

### Parameters
- **auto_describe** (bool) - Optional - If True, calls collect() on a collector at registration time if the collector does not implement describe().
- **target_info** (Dict[str, str]) - Optional - Key-value labels to attach as a target_info metric.
- **support_collectors_without_names** (bool) - Optional - If True, allows registering collectors that produce no named metrics.
```

--------------------------------

### Gauge(name, documentation, labelnames=(), namespace='', subsystem='', unit='', registry=REGISTRY, multiprocess_mode='all')

Source: https://prometheus.github.io/client_python/instrumenting/gauge

Constructor for creating a new Gauge metric instance.

```APIDOC
## Gauge Constructor

### Description
Creates a new Gauge metric. The full metric name is formed by joining namespace, subsystem, and name with underscores.

### Parameters
- **name** (str) - Required - Metric name.
- **documentation** (str) - Required - Help text shown in the /metrics output.
- **labelnames** (Iterable[str]) - Optional - Names of labels for this metric.
- **namespace** (str) - Optional - Optional prefix.
- **subsystem** (str) - Optional - Optional middle component.
- **unit** (str) - Optional - Optional unit suffix.
- **registry** (CollectorRegistry) - Optional - Registry to register with.
- **multiprocess_mode** (str) - Optional - How to aggregate this gauge across multiple processes.
```

--------------------------------

### Compressing push requests

Source: https://prometheus.github.io/client_python/exporting/pushgateway

Use the compression argument to enable gzip or snappy compression for network-constrained environments.

```python
push_to_gateway(
    'localhost:9091',
    job='batchA',
    registry=registry,
    handler=my_auth_handler,
    compression='gzip',
)
```

--------------------------------

### Enable Exemplar Storage in Prometheus

Source: https://prometheus.github.io/client_python/instrumenting/exemplars

Required feature flag to enable exemplar storage in the Prometheus server.

```bash
--enable-feature=exemplar-storage
```

--------------------------------

### Basic FastAPI Prometheus Integration

Source: https://prometheus.github.io/client_python/exporting/http/fastapi-gunicorn

Mounts the Prometheus ASGI application to the /metrics endpoint of a FastAPI app.

```python
from fastapi import FastAPI
from prometheus_client import make_asgi_app

# Create app
app = FastAPI(debug=False)

# Add prometheus asgi middleware to route /metrics requests
metrics_app = make_asgi_app()
app.mount("/metrics", metrics_app)
```

--------------------------------

### GraphiteBridge(address, tags=False)

Source: https://prometheus.github.io/client_python/bridges/graphite

Initializes a bridge to push metrics to a Graphite server.

```APIDOC
## GraphiteBridge(address, tags=False)

### Description
Initializes the bridge to connect to a Graphite server. Metrics can be pushed manually or via a background thread.

### Parameters
- **address** (tuple) - Required - A tuple containing the hostname and port of the Graphite server (e.g., ('graphite.your.org', 2003)).
- **tags** (bool) - Optional - Enable Graphite tags support. Defaults to False.

### Methods
- **push()**: Pushes metrics to the Graphite server once.
- **start(interval)**: Starts a daemon thread to push metrics every `interval` seconds.
```

--------------------------------

### Expose Metrics in Multiprocess Mode

Source: https://prometheus.github.io/client_python/multiprocess

Initialize a CollectorRegistry with support_collectors_without_names=True and use MultiProcessCollector to aggregate metrics.

```python
from prometheus_client import multiprocess
from prometheus_client import generate_latest, CollectorRegistry, CONTENT_TYPE_LATEST, Counter

MY_COUNTER = Counter('my_counter', 'Description of my counter')

# Expose metrics.
def app(environ, start_response):
    registry = CollectorRegistry(support_collectors_without_names=True)
    multiprocess.MultiProcessCollector(registry)
    data = generate_latest(registry)
    status = '200 OK'
    response_headers = [
        ('Content-type', CONTENT_TYPE_LATEST),
        ('Content-Length', str(len(data)))
    ]
    start_response(status, response_headers)
    return iter([data])
```

--------------------------------

### Counter(name, documentation, labelnames=(), namespace='', subsystem='', unit='', registry=REGISTRY)

Source: https://prometheus.github.io/client_python/instrumenting/counter

Constructor for creating a new Counter metric instance.

```APIDOC
## Counter Constructor

### Description
Creates a new Counter metric. A `_total` suffix is automatically appended to the metric name when exposed.

### Parameters
- **name** (str) - Required - Metric name.
- **documentation** (str) - Required - Help text for the metric.
- **labelnames** (Iterable[str]) - Optional - Names of labels for this metric.
- **namespace** (str) - Optional - Optional prefix.
- **subsystem** (str) - Optional - Optional middle component.
- **unit** (str) - Optional - Optional unit suffix.
- **registry** (CollectorRegistry) - Optional - Registry to register with.
```

--------------------------------

### Set target info labels

Source: https://prometheus.github.io/client_python/registry

Configures metadata labels exposed as a target_info metric.

```python
REGISTRY.set_target_info({'env': 'production', 'region': 'us-east-1'})
```

--------------------------------

### Enum(name, documentation, labelnames=(), namespace='', subsystem='', unit='', registry=REGISTRY, states=[])

Source: https://prometheus.github.io/client_python/instrumenting/enum

Constructor for creating a new Enum metric instance.

```APIDOC
## Enum Constructor

### Description
Creates a new Enum metric to track a fixed set of states. The first state in the list is the default.

### Parameters
- **name** (str) - Required - Metric name.
- **documentation** (str) - Required - Help text shown in the /metrics output.
- **labelnames** (Iterable[str]) - Optional - Names of labels for this metric.
- **namespace** (str) - Optional - Optional prefix.
- **subsystem** (str) - Optional - Optional middle component.
- **unit** (str) - Optional - Not supported; raises ValueError.
- **registry** (CollectorRegistry) - Optional - Registry to register with.
- **states** (List[str]) - Required - The complete list of valid states.
```

--------------------------------

### Skip global registration

Source: https://prometheus.github.io/client_python/registry

Demonstrates how to avoid registering metrics with the global registry.

```python
from prometheus_client import Counter, CollectorRegistry

# skip global registration — useful in tests
c = Counter('my_counter', 'A counter', registry=None)

# register with a custom registry
r = CollectorRegistry()
c2 = Counter('my_counter', 'A counter', registry=r)
```

--------------------------------

### Initialize label values

Source: https://prometheus.github.io/client_python/instrumenting/labels

Pre-initialize label values by calling the .labels() method without incrementing.

```python
from prometheus_client import Counter
c = Counter('my_requests_total', 'HTTP Failures', ['method', 'endpoint'])
c.labels('get', '/')
c.labels('post', '/submit')
```

--------------------------------

### Record Observations with observe()

Source: https://prometheus.github.io/client_python/instrumenting/summary

Record numerical values into the summary.

```python
s.observe(0.43)   # observe 430ms
s.observe(1024)   # observe 1024 bytes
```

--------------------------------

### Expose metrics using MetricsResource in Twisted

Source: https://prometheus.github.io/client_python/exporting/http/twisted

Integrates Prometheus metrics into a Twisted web server by attaching MetricsResource to a resource tree.

```python
from prometheus_client.twisted import MetricsResource
from twisted.web.server import Site
from twisted.web.resource import Resource
from twisted.internet import reactor

root = Resource()
root.putChild(b'metrics', MetricsResource())

factory = Site(root)
reactor.listenTCP(8000, factory)
reactor.run()
```

--------------------------------

### Increment Counter with amounts and exemplars

Source: https://prometheus.github.io/client_python/instrumenting/counter

Methods for incrementing the counter by specific amounts or attaching trace context via exemplars.

```python
c.inc()       # increment by 1
c.inc(5)      # increment by 5
c.inc(0.7)    # fractional increments are allowed
```

```python
c.inc(exemplar={'trace_id': 'abc123'})
```

--------------------------------

### Configuring TLS authentication

Source: https://prometheus.github.io/client_python/exporting/pushgateway

Implement a custom handler using tls_auth_handler to provide client certificates for secure communication.

```python
from prometheus_client import CollectorRegistry, Gauge, push_to_gateway
from prometheus_client.exposition import tls_auth_handler


def my_auth_handler(url, method, timeout, headers, data):
    certfile = 'client-crt.pem'
    keyfile = 'client-key.pem'
    return tls_auth_handler(url, method, timeout, headers, data, certfile, keyfile)

registry = CollectorRegistry()
g = Gauge('job_last_success_unixtime', 'Last time a batch job successfully finished', registry=registry)
g.set_to_current_time()
push_to_gateway('localhost:9091', job='batchA', registry=registry, handler=my_auth_handler)
```

--------------------------------

### Collect metrics from registry

Source: https://prometheus.github.io/client_python/registry

Iterates through all metrics yielded by the registry.

```python
for metric in REGISTRY.collect():
    print(metric.name, metric.type)
```

--------------------------------

### write_to_textfile(path, registry, escaping='allow-utf-8', tmpdir=None)

Source: https://prometheus.github.io/client_python/exporting/textfile

Writes metrics from a registry to a file in Prometheus text format atomically.

```APIDOC
## write_to_textfile(path, registry, escaping='allow-utf-8', tmpdir=None)

### Description
Writes metrics from the registry to a file in Prometheus text format. The file is written atomically by writing to a temporary file first and then renaming it, preventing the Node exporter from reading a partially written file.

### Parameters
- **path** (str) - Required - Destination file path. Must end in .prom for the Node exporter textfile collector to process it.
- **registry** (Collector) - Required - Registry whose metrics are written.
- **escaping** (str) - Optional (Default: 'allow-utf-8') - Escaping scheme for metric and label names. Accepted values: 'allow-utf-8', 'underscores', 'dots', 'values'.
- **tmpdir** (Optional[str]) - Optional (Default: None) - Directory for the temporary file used during the atomic write. Defaults to the same directory as path.

### Returns
- **None** - Raises an exception if the file cannot be written.
```

--------------------------------

### Add Exemplars to Counter Metrics

Source: https://prometheus.github.io/client_python/instrumenting/exemplars

Attach exemplars to counter increments using a dictionary of label-value pairs.

```python
from prometheus_client import Counter
c = Counter('my_requests_total', 'HTTP Failures', ['method', 'endpoint'])
c.labels('get', '/').inc(exemplar={'trace_id': 'abc123'})
c.labels('post', '/submit').inc(1.0, {'trace_id': 'def456'})
```

--------------------------------

### Expose metrics in AIOHTTP

Source: https://prometheus.github.io/client_python/exporting/http/aiohttp

Use make_aiohttp_handler to create a metrics endpoint for an AIOHTTP application.

```python
from aiohttp import web
from prometheus_client.aiohttp import make_aiohttp_handler

app = web.Application()
app.router.add_get("/metrics", make_aiohttp_handler())
```

--------------------------------

### Configure Flask with Prometheus Middleware

Source: https://prometheus.github.io/client_python/exporting/http/flask

Uses DispatcherMiddleware to route /metrics requests to the Prometheus WSGI application.

```python
from flask import Flask
from werkzeug.middleware.dispatcher import DispatcherMiddleware
from prometheus_client import make_wsgi_app

# Create my app
app = Flask(__name__)

# Add prometheus wsgi middleware to route /metrics requests
app.wsgi_app = DispatcherMiddleware(app.wsgi_app, {
    '/metrics': make_wsgi_app()
})
```

--------------------------------

### ProcessCollector

Source: https://prometheus.github.io/client_python/collector

Initializes a collector that gathers process metrics from the /proc filesystem. This collector is only available on Linux systems.

```APIDOC
## ProcessCollector(namespace='', pid=lambda: 'self', proc='/proc', registry=REGISTRY)

### Description
Collects process metrics from /proc. Only available on Linux.

### Parameters
- **namespace** (str) - Optional - Prefix added to all metric names, e.g. 'mydaemon' produces mydaemon_process_cpu_seconds_total.
- **pid** (Callable[[], int or str]) - Optional - Callable that returns the PID to monitor. 'self' monitors the current process.
- **proc** (str) - Optional - Path to the proc filesystem. Useful for testing or containerised environments with a non-standard mount point.
- **registry** (CollectorRegistry) - Optional - Registry to register with. Pass None to skip registration.
```

--------------------------------

### Pushing metrics with Graphite tags

Source: https://prometheus.github.io/client_python/bridges/graphite

Enables Graphite tag support by setting the tags parameter to True during bridge initialization.

```python
from prometheus_client.bridge.graphite import GraphiteBridge

gb = GraphiteBridge(('graphite.your.org', 2003), tags=True)
c = Counter('my_requests_total', 'HTTP Failures', ['method', 'endpoint'])
c.labels('get', '/').inc()
gb.push()
```

--------------------------------

### Info Metric Constructor

Source: https://prometheus.github.io/client_python/instrumenting/info

Signature for the Info class constructor.

```python
Info(name, documentation, labelnames=(), namespace='', subsystem='', unit='', registry=REGISTRY)
```

--------------------------------

### Pushing metrics to Graphite

Source: https://prometheus.github.io/client_python/bridges/graphite

Initializes the GraphiteBridge and pushes metrics either once or periodically in a daemon thread.

```python
from prometheus_client.bridge.graphite import GraphiteBridge

gb = GraphiteBridge(('graphite.your.org', 2003))
# Push once.
gb.push()
# Push every 10 seconds in a daemon thread.
gb.start(10.0)
```

--------------------------------

### Push metrics with HTTP Basic Authentication

Source: https://prometheus.github.io/client_python/exporting/pushgateway

Configures a custom handler to inject Authorization headers when connecting to a protected Pushgateway.

```python
from prometheus_client import CollectorRegistry, Gauge, push_to_gateway
from prometheus_client.exposition import basic_auth_handler

def my_auth_handler(url, method, timeout, headers, data):
    username = 'foobar'
    password = 'secret123'
    return basic_auth_handler(url, method, timeout, headers, data, username, password)
registry = CollectorRegistry()
g = Gauge('job_last_success_unixtime', 'Last time a batch job successfully finished', registry=registry)
g.set_to_current_time()
push_to_gateway('localhost:9091', job='batchA', registry=registry, handler=my_auth_handler)
```

--------------------------------

### Define and increment labeled metrics with keyword arguments

Source: https://prometheus.github.io/client_python/instrumenting/labels

Labels can be passed as keyword arguments for better readability.

```python
from prometheus_client import Counter
c = Counter('my_requests_total', 'HTTP Failures', ['method', 'endpoint'])
c.labels(method='get', endpoint='/').inc()
c.labels(method='post', endpoint='/submit').inc()
```

--------------------------------

### Observing Values

Source: https://prometheus.github.io/client_python/instrumenting/histogram

Record observations with or without exemplar trace context.

```python
h.observe(0.43)   # observe 430ms
```

```python
h.observe(0.43, exemplar={'trace_id': 'abc123'})
```

--------------------------------

### Proxying metrics with a custom Collector

Source: https://prometheus.github.io/client_python/collector/custom

Implements a custom collector to expose queue statistics as Gauge and Counter metrics. Requires registering the collector instance with the global REGISTRY.

```python
from prometheus_client.core import CounterMetricFamily, GaugeMetricFamily, REGISTRY
from prometheus_client.registry import Collector
from prometheus_client import start_http_server

# Simulated external data source
_QUEUE_STATS = {
    'orders': {'depth': 14, 'processed': 9821},
    'notifications': {'depth': 3, 'processed': 45210},
}

class QueueCollector(Collector):
    def collect(self):
        depth = GaugeMetricFamily(
            'queue_depth',
            'Current number of messages waiting in the queue',
            labels=['queue'],
        )
        processed = CounterMetricFamily(
            'queue_messages_processed_total',
            'Total messages processed from the queue',
            labels=['queue'],
        )
        for name, stats in _QUEUE_STATS.items():
            depth.add_metric([name], stats['depth'])
            processed.add_metric([name], stats['processed'])
        yield depth
        yield processed

REGISTRY.register(QueueCollector())

if __name__ == '__main__':
    start_http_server(8000)
    import time
    while True:
        time.sleep(1)
```

--------------------------------

### Gauge Constructor

Source: https://prometheus.github.io/client_python/instrumenting/gauge

Signature for the Gauge constructor.

```python
Gauge(name, documentation, labelnames=(), namespace='', subsystem='', unit='', registry=REGISTRY, multiprocess_mode='all')
```

--------------------------------

### info(val)

Source: https://prometheus.github.io/client_python/instrumenting/info

Method to set the key-value pairs for the Info metric.

```APIDOC
## Method: info(val)

### Description
Sets the key-value pairs for this metric. Calling this method overwrites any previous values.

### Parameters
- **val** (dict[str, str]) - Required - A dictionary of string keys and values representing the metadata.
```

--------------------------------

### PlatformCollector

Source: https://prometheus.github.io/client_python/collector

Initializes a collector that exports Python runtime metadata as a python_info gauge metric.

```APIDOC
## PlatformCollector(registry=REGISTRY, platform=None)

### Description
Exports Python runtime metadata as a python_info gauge metric with labels.

### Parameters
- **registry** (CollectorRegistry) - Optional - Registry to register with. Pass None to skip registration.
- **platform** (module) - Optional - Override the platform module. Intended for testing.
```

--------------------------------

### Initialize MultiProcessCollector

Source: https://prometheus.github.io/client_python/multiprocess

Registers a collector to aggregate metrics from the multiprocess directory. Ensure the registry is created within the request context to avoid duplicates.

```python
from prometheus_client import multiprocess, CollectorRegistry

def app(environ, start_response):
    registry = CollectorRegistry(support_collectors_without_names=True)
    multiprocess.MultiProcessCollector(registry)
    ...
```

```python
collector = multiprocess.MultiProcessCollector(registry, path='/var/run/prom')
```

--------------------------------

### MultiProcessCollector(registry, path=None)

Source: https://prometheus.github.io/client_python/multiprocess

Initializes a collector that aggregates metrics written by all processes in the specified multiprocess directory.

```APIDOC
## MultiProcessCollector(registry, path=None)

### Description
Collector that aggregates metrics written by all processes in the multiprocess directory.

### Parameters
- **registry** (CollectorRegistry) - Required - Registry to register with.
- **path** (Optional[str]) - Optional - Path to the directory containing the per-process metric files. Defaults to the PROMETHEUS_MULTIPROC_DIR environment variable.

### Exceptions
- **ValueError**: Raised if path is not set or does not point to an existing directory.
```

--------------------------------

### Basic Gauge Usage

Source: https://prometheus.github.io/client_python/instrumenting/gauge

Initialize a Gauge and perform basic increment, decrement, and set operations.

```python
from prometheus_client import Gauge
g = Gauge('my_inprogress_requests', 'Description of gauge')
g.inc()      # Increment by 1
g.dec(10)    # Decrement by given value
g.set(4.2)   # Set to a given value
```

--------------------------------

### Timing Code Execution

Source: https://prometheus.github.io/client_python/instrumenting/histogram

Use the time() method as a decorator or context manager to track duration.

```python
@h.time()
def process():
    pass

with h.time():
    pass

with h.time() as t:
    pass
print(t.duration) # observed time in seconds.
```

--------------------------------

### instance_ip_grouping_key

Source: https://prometheus.github.io/client_python/exporting/pushgateway

Returns a grouping key dict with the instance label set to the IP address of the current host.

```APIDOC
## instance_ip_grouping_key()

### Description
Returns a grouping key dict with the instance label set to the IP address of the current host. Takes no parameters.
```

--------------------------------

### make_aiohttp_handler

Source: https://prometheus.github.io/client_python/exporting/http/aiohttp

Creates a handler for AIOHTTP to serve Prometheus metrics. It supports optional response compression.

```APIDOC
## make_aiohttp_handler

### Description
Creates a handler to be used with AIOHTTP routes to expose Prometheus metrics.

### Parameters
- **disable_compression** (bool) - Optional - If set to True, disables automatic response compression for the metrics endpoint.

### Usage Example
```python
from aiohttp import web
from prometheus_client.aiohttp import make_aiohttp_handler

app = web.Application()
# Register the metrics handler
app.router.add_get("/metrics", make_aiohttp_handler())

# Example with compression disabled
app.router.add_get("/metrics", make_aiohttp_handler(disable_compression=True))
```
```

--------------------------------

### Updating Info Metric Values

Source: https://prometheus.github.io/client_python/instrumenting/info

Use the info() method to set or overwrite key-value pairs for the metric.

```python
i.info({'version': '1.4.2', 'revision': 'abc123', 'branch': 'main'})
```

--------------------------------

### Histogram Constructor

Source: https://prometheus.github.io/client_python/instrumenting/histogram

Initializes a new Histogram metric. The full metric name is formed by joining namespace, subsystem, and name with underscores.

```APIDOC
## Histogram(name, documentation, labelnames=(), namespace='', subsystem='', unit='', registry=REGISTRY, buckets=DEFAULT_BUCKETS)

### Description
Creates a new Histogram instance to track distributions.

### Parameters
- **name** (str) - Required - Metric name.
- **documentation** (str) - Required - Help text shown in the /metrics output.
- **labelnames** (Iterable[str]) - Optional - Names of labels for this metric.
- **namespace** (str) - Optional - Optional prefix.
- **subsystem** (str) - Optional - Optional middle component.
- **unit** (str) - Optional - Optional unit suffix.
- **registry** (CollectorRegistry) - Optional - Registry to register with.
- **buckets** (Sequence[float]) - Optional - Upper bounds of the histogram buckets.
```

--------------------------------

### Initialize and set Enum state

Source: https://prometheus.github.io/client_python/instrumenting/enum

Basic usage of the Enum class to define states and update the current state.

```python
from prometheus_client import Enum
e = Enum('my_task_state', 'Description of enum',
        states=['starting', 'running', 'stopped'])
e.state('running')
```

--------------------------------

### Push metrics to the Pushgateway

Source: https://prometheus.github.io/client_python/exporting/pushgateway

Uses a custom CollectorRegistry to push metrics to a specified Pushgateway instance.

```python
from prometheus_client import CollectorRegistry, Gauge, push_to_gateway

registry = CollectorRegistry()
g = Gauge('job_last_success_unixtime', 'Last time a batch job successfully finished', registry=registry)
g.set_to_current_time()
push_to_gateway('localhost:9091', job='batchA', registry=registry)
```

--------------------------------

### register(collector)

Source: https://prometheus.github.io/client_python/registry

Registers a collector with the registry.

```APIDOC
## register(collector)

### Description
Register a collector with this registry. Raises ValueError if any of the metric names the collector produces are already registered.
```

--------------------------------

### Histogram Constructor Signature

Source: https://prometheus.github.io/client_python/instrumenting/histogram

The signature for creating a new Histogram instance.

```python
Histogram(name, documentation, labelnames=(), namespace='', subsystem='', unit='', registry=REGISTRY, buckets=DEFAULT_BUCKETS)
```

--------------------------------

### get_target_info()

Source: https://prometheus.github.io/client_python/registry

Returns current target info labels.

```APIDOC
## get_target_info()

### Description
Return the current target info labels as a Dict[str, str], or None if not set.
```

--------------------------------

### Initialize and increment a Counter

Source: https://prometheus.github.io/client_python/instrumenting/counter

Basic usage of the Counter class to track values that only go up.

```python
from prometheus_client import Counter
c = Counter('my_failures', 'Description of counter')
c.inc()     # Increment by 1
c.inc(1.6)  # Increment by given value
```

--------------------------------

### basic_auth_handler

Source: https://prometheus.github.io/client_python/exporting/pushgateway

Wraps the default HTTP handler to include HTTP Basic Authentication headers.

```APIDOC
## basic_auth_handler(url, method, timeout, headers, data, username=None, password=None)

### Description
Wraps the default handler and adds an HTTP Basic Auth header to the request.

### Parameters
- **url** (str) - Required - Full request URL
- **method** (str) - Required - HTTP method (PUT, POST, DELETE)
- **timeout** (Optional[float]) - Required - Seconds before aborting
- **headers** (List[Tuple[str, str]]) - Required - HTTP headers to include
- **data** (bytes) - Required - Request body
- **username** (Optional[str]) - Optional - HTTP Basic Auth username
- **password** (Optional[str]) - Optional - HTTP Basic Auth password
```

--------------------------------

### collect()

Source: https://prometheus.github.io/client_python/registry

Yields all metrics from every registered collector.

```APIDOC
## collect()

### Description
Yield all metrics from every registered collector. Also yields the target_info metric if one has been set.
```

--------------------------------

### Tracking In-Progress Operations

Source: https://prometheus.github.io/client_python/instrumenting/gauge

Use as a decorator or context manager to track active operations.

```python
@g.track_inprogress()
def process_job():
    pass

with g.track_inprogress():
    pass
```

--------------------------------

### observe(amount)

Source: https://prometheus.github.io/client_python/instrumenting/summary

Records a single observation for the summary.

```APIDOC
## observe(amount)

### Description
Records a single observation. The amount is typically positive or zero.

### Parameters
- **amount** (float/int) - Required - The value to observe.
```

--------------------------------

### GCCollector

Source: https://prometheus.github.io/client_python/collector

Initializes a collector that exports Python garbage collector statistics. This is only active on CPython.

```APIDOC
## GCCollector(registry=REGISTRY)

### Description
Exports Python garbage collector statistics. Only active on CPython (skipped silently on other implementations).

### Parameters
- **registry** (CollectorRegistry) - Optional - Registry to register with.
```

--------------------------------

### Configure ProcessCollector for a custom PID

Source: https://prometheus.github.io/client_python/collector

Use a lambda function to provide a dynamic PID for monitoring specific processes.

```python
ProcessCollector(namespace='mydaemon', pid=lambda: open('/var/run/daemon.pid').read())
```

--------------------------------

### Enum constructor signature

Source: https://prometheus.github.io/client_python/instrumenting/enum

The constructor parameters for defining an Enum metric.

```python
Enum(name, documentation, labelnames=(), namespace='', subsystem='', unit='', registry=REGISTRY, states=[])
```

--------------------------------

### set_target_info(labels)

Source: https://prometheus.github.io/client_python/registry

Sets or replaces target metadata labels.

```APIDOC
## set_target_info(labels)

### Description
Set or replace the target metadata labels exposed as a target_info metric. Pass None to remove the target info metric.
```