Health Check Endpoint with Dependency Probes

                  class HealthController < ActionController::API
  def show
    checks = {
      db: db_ok?,
      redis: redis_ok?
    }

    status = checks.values.all? ? 200 : 503
    render status: status, json: checks.merge(time: Time.current.iso8601)
  end

  private

  def db_ok?
    ApplicationRecord.connection.select_value('SELECT 1') == 1
  rescue StandardError
    false
  end

  def redis_ok?
    Redis.current.ping == 'PONG'
  rescue StandardError
    false
  end
end