78 lines
2.2 KiB
Ruby
78 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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require 'prometheus/client/support/unicorn'
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module Gitlab
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module Metrics
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module Samplers
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class RubySampler < BaseSampler
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def metrics
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@metrics ||= init_metrics
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end
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def with_prefix(prefix, name)
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"ruby_#{prefix}_#{name}".to_sym
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end
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def to_doc_string(name)
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name.to_s.humanize
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end
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def labels
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{}
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end
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def init_metrics
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metrics = {}
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metrics[:sampler_duration] = Metrics.counter(with_prefix(:sampler, :duration_seconds_total), 'Sampler time', labels)
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metrics[:total_time] = Metrics.counter(with_prefix(:gc, :duration_seconds_total), 'Total GC time', labels)
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GC.stat.keys.each do |key|
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metrics[key] = Metrics.gauge(with_prefix(:gc_stat, key), to_doc_string(key), labels, :livesum)
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end
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metrics[:memory_usage] = Metrics.gauge(with_prefix(:memory, :bytes), 'Memory used', labels, :livesum)
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metrics[:file_descriptors] = Metrics.gauge(with_prefix(:file, :descriptors), 'File descriptors used', labels, :livesum)
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metrics
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end
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def sample
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start_time = System.monotonic_time
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metrics[:memory_usage].set(labels.merge(worker_label), System.memory_usage)
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metrics[:file_descriptors].set(labels.merge(worker_label), System.file_descriptor_count)
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sample_gc
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metrics[:sampler_duration].increment(labels, System.monotonic_time - start_time)
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ensure
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GC::Profiler.clear
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end
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private
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def sample_gc
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# Collect generic GC stats.
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GC.stat.each do |key, value|
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metrics[key].set(labels, value)
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end
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# Collect the GC time since last sample in float seconds.
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metrics[:total_time].increment(labels, GC::Profiler.total_time)
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end
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def worker_label
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return {} unless defined?(Unicorn::Worker)
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worker_no = ::Prometheus::Client::Support::Unicorn.worker_id
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if worker_no
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{ worker: worker_no }
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else
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{ worker: 'master' }
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end
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end
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end
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end
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end
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end
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