97 lines
3.2 KiB
Ruby
97 lines
3.2 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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GC_REPORT_BUCKETS = [0.005, 0.01, 0.02, 0.04, 0.07, 0.1, 0.5].freeze
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def initialize(interval)
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GC::Profiler.clear
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metrics[:process_start_time_seconds].set(labels, Time.now.to_i)
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super
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end
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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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file_descriptors: ::Gitlab::Metrics.gauge(with_prefix(:file, :descriptors), 'File descriptors used', labels),
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memory_bytes: ::Gitlab::Metrics.gauge(with_prefix(:memory, :bytes), 'Memory used', labels),
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process_cpu_seconds_total: ::Gitlab::Metrics.gauge(with_prefix(:process, :cpu_seconds_total), 'Process CPU seconds total'),
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process_max_fds: ::Gitlab::Metrics.gauge(with_prefix(:process, :max_fds), 'Process max fds'),
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process_resident_memory_bytes: ::Gitlab::Metrics.gauge(with_prefix(:process, :resident_memory_bytes), 'Memory used', labels),
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process_start_time_seconds: ::Gitlab::Metrics.gauge(with_prefix(:process, :start_time_seconds), 'Process start time seconds'),
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sampler_duration: ::Gitlab::Metrics.counter(with_prefix(:sampler, :duration_seconds_total), 'Sampler time', labels),
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gc_duration_seconds: ::Gitlab::Metrics.histogram(with_prefix(:gc, :duration_seconds), 'GC time', labels, GC_REPORT_BUCKETS)
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}
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GC.stat.keys.each do |key|
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metrics[key] = ::Gitlab::Metrics.gauge(with_prefix(:gc_stat, key), to_doc_string(key), labels)
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end
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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[:file_descriptors].set(labels, System.file_descriptor_count)
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metrics[:process_cpu_seconds_total].set(labels, ::Gitlab::Metrics::System.cpu_time)
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metrics[:process_max_fds].set(labels, ::Gitlab::Metrics::System.max_open_file_descriptors)
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set_memory_usage_metrics
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sample_gc
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metrics[:sampler_duration].increment(labels, System.monotonic_time - start_time)
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end
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private
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def sample_gc
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# Observe all GC samples
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sample_gc_reports.each do |report|
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metrics[:gc_duration_seconds].observe(labels, report[:GC_TIME])
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end
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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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end
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def sample_gc_reports
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GC::Profiler.enable
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GC::Profiler.raw_data
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ensure
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GC::Profiler.clear
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end
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def set_memory_usage_metrics
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memory_usage = System.memory_usage
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metrics[:memory_bytes].set(labels, memory_usage)
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metrics[:process_resident_memory_bytes].set(labels, memory_usage)
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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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