Start Prometheus exporter along with the Rails server

.app_version

@@ -1 +1 @@
-0.16.5
+0.16.6

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+# 0.16.6 - 2024-11-20
+
+### Added
+
+- Dawarich now exports metrics to Prometheus. You can find the metrics at `/metrics` endpoint. The metrics are being exported in the Prometheus format and can be scraped by Prometheus server. You can find an example of how to scrape the metrics in the `docker-compose.yml` file in the repository.
+
 # 0.16.5 - 2024-11-18
 
 ### Changed

Gemfile

@@ -6,7 +6,6 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby File.read('.ruby-version').strip
 
 gem 'bootsnap', require: false
-gem 'prometheus_exporter'
 gem 'chartkick'
 gem 'data_migrate'
 gem 'devise'
@@ -19,6 +18,7 @@ gem 'kaminari'
 gem 'lograge'
 gem 'oj'
 gem 'pg'
+gem 'prometheus_exporter'
 gem 'puma'
 gem 'pundit'
 gem 'rails'

Procfile.dev

@@ -1 +1,2 @@
 web: bin/rails server -p 3000 -b 0.0.0.0
+prometheus_exporter: bundle exec prometheus_exporter

config/puma.rb

@@ -42,7 +42,7 @@ pidfile ENV.fetch("PIDFILE") { "tmp/pids/server.pid" }
 # Allow puma to be restarted by `bin/rails restart` command.
 plugin :tmp_restart
 
-# in unicorn/puma/passenger be sure to run a new process instrumenter after fork
+# Promethues exporter
 after_worker_boot do
   require 'prometheus_exporter/instrumentation'
   PrometheusExporter::Instrumentation::Process.start(type:"web")