65 lines
2.1 KiB
Ruby
65 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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require_relative '../config/boot'
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require_relative 'dependencies'
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class MetricsServer # rubocop:disable Gitlab/NamespacedClass
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class << self
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def spawn(target, metrics_dir:, wipe_metrics_dir: false, trapped_signals: [])
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raise "The only valid target is 'sidekiq' currently" unless target == 'sidekiq'
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pid = Process.fork
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if pid.nil? # nil means we're inside the fork
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# Remove any custom signal handlers the parent process had registered, since we do
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# not want to inherit them, and Ruby forks with a `clone` that has the `CLONE_SIGHAND`
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# flag set.
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Gitlab::ProcessManagement.modify_signals(trapped_signals, 'DEFAULT')
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server = MetricsServer.new(target, metrics_dir, wipe_metrics_dir)
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# This rewrites /proc/cmdline, since otherwise tools like `top` will show the
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# parent process `cmdline` which is really confusing.
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$0 = server.name
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server.start
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else
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Process.detach(pid)
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end
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pid
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end
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end
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def initialize(target, metrics_dir, wipe_metrics_dir)
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@target = target
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@metrics_dir = metrics_dir
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@wipe_metrics_dir = wipe_metrics_dir
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end
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def start
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::Prometheus::Client.configure do |config|
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config.multiprocess_files_dir = @metrics_dir
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config.pid_provider = proc { "#{@target}_exporter" }
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end
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FileUtils.mkdir_p(@metrics_dir, mode: 0700)
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::Prometheus::CleanupMultiprocDirService.new.execute if @wipe_metrics_dir
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# We need to `warmup: true` since otherwise the sampler and exporter threads enter
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# a race where not all Prometheus db files will be visible to the exporter, resulting
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# in missing metrics.
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# Warming up ensures that these files exist prior to the exporter starting up.
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Gitlab::Metrics::Samplers::RubySampler.initialize_instance(warmup: true).start
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exporter_class = "Gitlab::Metrics::Exporter::#{@target.camelize}Exporter".constantize
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settings = Settings.new(Settings.monitoring[name])
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server = exporter_class.instance(settings, gc_requests: true, synchronous: true)
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server.start
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end
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def name
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"#{@target}_exporter"
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end
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end
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