### Install Yabeda Prometheus Gem

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

Add the yabeda-prometheus gem to your application's Gemfile to install the adapter. After adding the line, execute `bundle` to install the gem and its dependencies.

```ruby
gem 'yabeda-prometheus'
```

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

### Start Standalone Metrics Server

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

Launch a separate WEBrick server thread to serve metrics on `/metrics`. Ensure 'webrick' gem is included or use `rack_app` with your preferred application server if running on Ruby 3.0+.

```ruby
Yabeda::Prometheus::Exporter.start_metrics_server!
```

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

### Define Gauge Aggregation Policy

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

Specify the aggregation policy for gauges when declaring them. For example, use `:max` to store the maximum value observed.

```ruby
group :some do
  gauge :tasks do
    comment "Number of test tasks"
    aggregation :max
  end
end
```

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

### Configure DirectFileStore for Multi-process

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

To aggregate metrics across multiple processes (e.g., Unicorn, Puma clusters), configure the `prometheus-client` gem to use `DirectFileStore`. Specify a directory for metric storage.

```ruby
Prometheus::Client.config.data_store = Prometheus::Client::DataStores::DirectFileStore.new(dir: '/tmp/prometheus_direct_file_store')
```

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

### Export Metrics via Rack Middleware

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

Integrate Yabeda::Prometheus::Exporter as Rack middleware in your `config.ru` file to expose metrics on a specific path (default `/metrics`). The `:path` and `:port` options can be configured.

```ruby
use Yabeda::Prometheus::Exporter
```

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

### Push Tags and Commits

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

Pushes all local commits and tags to the remote repository. The `--follow-tags` option ensures that all associated tags are also pushed.

```Shell
git push --follow-tags
```

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

### Create Annotated Git Tag

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

Creates an annotated Git tag for the new version. The tag message includes the version number and can be edited. The `--sign` option is used for signing the tag.

```Shell
git tag v${version} --annotate --message="${version}: " --edit --sign
```

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

### Configure Metrics Server Logger

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

Optionally provide a logger instance, such as `Rails.application.logger`, to the `start_metrics_server!` method for logging exporter activity.

```ruby
Yabeda::Prometheus::Exporter.start_metrics_server! logger: Rails.application.logger
```

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

### Enable Debugging Metrics

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

Debugging metrics, such as `yabeda_prometheus_render_duration`, are enabled by setting `YABEDA_DEBUG=true` in your environment variables.

```bash
export YABEDA_DEBUG=true
```

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

### Push Metrics to Push Gateway

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

For short-lived processes like rake tasks or cron jobs, use the push gateway to send collected metrics. Configure the push gateway address via the `PROMETHEUS_PUSH_GATEWAY` environment variable.

```ruby
Yabeda::Prometheus.push_gateway.add(Yabeda::Prometheus.registry)
```

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

### Mount Exporter in Rails Routes

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

Mount the Yabeda::Prometheus::Exporter as a standalone Rack application within your Rails application's routes. This makes metrics available at the specified mount path.

```ruby
Rails.application.routes.draw do
  mount Yabeda::Prometheus::Exporter, at: "/metrics"
end
```

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

### Commit Gem Version

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

Commits the updated version file and creates a commit message with the new version number. It uses Ruby to read the version from the file.

```Shell
git add lib/yabeda/prometheus/version.rb CHANGELOG.md
version=$(ruby -r ./lib/yabeda/prometheus/version.rb -e "puts Gem::Version.new(Yabeda::Prometheus::VERSION)")
git commit --message="${version}: " --edit
```

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

### Check Gem Version

Source: https://github.com/yabeda-rb/yabeda-prometheus/blob/master/README.md

Checks the current version of the gem using Ruby's Gem::Version class. This is useful for verifying the version number before or after bumping it.

```Ruby
Gem::Version.new(Yabeda::Prometheus::VERSION).to_s
```

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