Overview

This documentation provides a step-by-step guide on how to monitor the gitlab-org/coming-soon project in a production environment. It highlights key aspects of production monitoring, including metrics collection, alerting mechanisms, and log management. Familiarity with the codebase and its components is assumed.

Monitoring Metrics

Monitoring is crucial to maintaining the health and performance of the application. In the gitlab-org/coming-soon project, metrics are collected using a combination of built-in tools and external services.

Example: Custom Metrics Configuration

The following code snippet illustrates how to configure custom metrics:

# config/initializers/metrics.rb

require 'prometheus/client'

prometheus = Prometheus::Client.registry

# Define a new counter metric
page_loads = Prometheus::Client::Gauge.new(:page_loads, docstring: 'Number of page loads')
prometheus.register(page_loads)

# Increment the counter on each page load
page_loads.set(1)

This code defines a custom metric to count the number of page loads. It leverages the Prometheus client library to create and manage metrics.

Alerting Setup

To ensure timely responses to potential issues, it’s vital to set up alerting based on defined thresholds for your metrics. This can be achieved with Prometheus Alertmanager.

Example: Configuring an Alert Rule

Here’s an example of an alert rule configuration:

# alert_rules.yaml

groups:
- name: coming-soon-alerts
  rules:
  - alert: HighPageLoadCount
    expr: page_loads > 100
    for: 5m
    labels:
      severity: critical
    annotations:
      summary: "High Page Load Count Alert"
      description: "Page load count exceeded threshold for more than 5 minutes."

In this example, an alert is triggered when the page_loads metric exceeds 100 for over 5 minutes. The alert includes severity levels and descriptive annotations to assist with incident management.

Log Management

Effective logging is essential for troubleshooting and monitoring application behavior. The gitlab-org/coming-soon project utilizes structured logging for ease of analysis.

Example: Implementing Structured Logging

Below is a code snippet demonstrating structured logging:

# app/controllers/application_controller.rb

def some_action
  logger.info({ message: 'Action executed', action: 'some_action', user_id: current_user.id })
  # Your logic here
end

By logging in a structured format, logs can be easily parsed and analyzed, improving overall visibility into application performance.

Performance Monitoring Tools

In addition to custom metrics and alerting, integrating third-party performance monitoring tools can provide deeper insights into your application. Tools such as New Relic or Datadog can be leveraged.

Example: Integrating New Relic

To integrate New Relic, ensure the gem is added to your Gemfile:

# Gemfile

gem 'newrelic_rpm'

Next, configure the New Relic agent in an initializer:

# config/initializers/new_relic.rb

NewRelic::Agent.manual_start

Utilizing these tools allows for more comprehensive monitoring, including transaction tracing and error reporting.

Conclusion

This document has outlined the essential components of production monitoring for the gitlab-org/coming-soon project, including metrics configuration, alert setup, log management, and performance monitoring tool integration. Implementing these practices will contribute to a robust and resilient production environment.

For further details, refer to the official documentation for the tools mentioned.