110 lines
4.0 KiB
Ruby
110 lines
4.0 KiB
Ruby
# frozen_string_literal: true
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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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DEFAULT_SAMPLING_INTERVAL_SECONDS = 60
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GC_REPORT_BUCKETS = [0.01, 0.05, 0.1, 0.2, 0.3, 0.5, 1].freeze
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def initialize(prefix: nil, **options)
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@prefix = prefix
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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(**options)
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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 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(metric_name(:file, :descriptors), 'File descriptors used', labels),
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process_cpu_seconds_total: ::Gitlab::Metrics.gauge(metric_name(:process, :cpu_seconds_total), 'Process CPU seconds total'),
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process_max_fds: ::Gitlab::Metrics.gauge(metric_name(:process, :max_fds), 'Process max fds'),
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process_resident_memory_bytes: ::Gitlab::Metrics.gauge(metric_name(:process, :resident_memory_bytes), 'Memory used (RSS)', labels),
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process_unique_memory_bytes: ::Gitlab::Metrics.gauge(metric_name(:process, :unique_memory_bytes), 'Memory used (USS)', labels),
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process_proportional_memory_bytes: ::Gitlab::Metrics.gauge(metric_name(:process, :proportional_memory_bytes), 'Memory used (PSS)', labels),
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process_start_time_seconds: ::Gitlab::Metrics.gauge(metric_name(:process, :start_time_seconds), 'Process start time seconds'),
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sampler_duration: ::Gitlab::Metrics.counter(metric_name(:sampler, :duration_seconds_total), 'Sampler time', labels),
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gc_duration_seconds: ::Gitlab::Metrics.histogram(metric_name(:gc, :duration_seconds), 'GC time', labels, GC_REPORT_BUCKETS),
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heap_fragmentation: ::Gitlab::Metrics.gauge(metric_name(:gc_stat_ext, :heap_fragmentation), 'Ruby heap fragmentation', labels)
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}
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GC.stat.keys.each do |key|
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metrics[key] = ::Gitlab::Metrics.gauge(metric_name(: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 metric_name(group, metric)
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name = "ruby_#{group}_#{metric}"
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name = "#{@prefix}_#{name}" if @prefix.present?
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name.to_sym
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end
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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.then do |gc_stat|
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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 custom GC stats
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metrics[:heap_fragmentation].set(labels, Memory.gc_heap_fragmentation(gc_stat))
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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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metrics[:process_resident_memory_bytes].set(labels, System.memory_usage_rss)
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if Gitlab::Utils.to_boolean(ENV['enable_memory_uss_pss'] || '1')
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memory_uss_pss = System.memory_usage_uss_pss
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metrics[:process_unique_memory_bytes].set(labels, memory_uss_pss[:uss])
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metrics[:process_proportional_memory_bytes].set(labels, memory_uss_pss[:pss])
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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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