openproject/config/initializers/health_checks.rb

class DelayedJobNeverRanCheck < OkComputer::Check
  attr_reader :threshold

  def initialize(minute_threshold)
    @threshold = minute_threshold.to_i
  end

  def check
    never_ran = Delayed::Job.where('run_at < ?', threshold.minutes.ago).count

    if never_ran.zero?
      mark_message "All previous jobs have completed within the past #{threshold} minutes."
    else
      mark_failure
      mark_message "#{never_ran} jobs waiting to be executed for more than #{threshold} minutes"
    end
  end
end

# Mount at /health_checks
OkComputer.mount_at = 'health_checks'

# Register delayed_job backed up test
dj_max = OpenProject::Configuration.health_checks_jobs_queue_count_threshold
OkComputer::Registry.register "delayed_jobs_backed_up",
                              OkComputer::DelayedJobBackedUpCheck.new(0, dj_max)

dj_never_ran_max = OpenProject::Configuration.health_checks_jobs_never_ran_minutes_ago
OkComputer::Registry.register "delayed_jobs_never_ran",
                              DelayedJobNeverRanCheck.new(dj_never_ran_max)

# Make dj backed up optional due to bursts
OkComputer.make_optional %w(delayed_jobs_backed_up)

# Check if authentication required
authentication_password = OpenProject::Configuration.health_checks_authentication_password
if authentication_password.present?
  OkComputer.require_authentication('health_checks', authentication_password)
end