debian-mirror-gitlab/lib/gitlab/metrics/samplers/ruby_sampler.rb

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# frozen_string_literal: true
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require 'prometheus/client/support/unicorn'
module Gitlab
module Metrics
module Samplers
class RubySampler < BaseSampler
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SAMPLING_INTERVAL_SECONDS = 60
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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(*)
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GC::Profiler.clear
metrics[:process_start_time_seconds].set(labels, Time.now.to_i)
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super
end
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def metrics
@metrics ||= init_metrics
end
def with_prefix(prefix, name)
"ruby_#{prefix}_#{name}".to_sym
end
def to_doc_string(name)
name.to_s.humanize
end
def labels
{}
end
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),
process_cpu_seconds_total: ::Gitlab::Metrics.gauge(with_prefix(:process, :cpu_seconds_total), 'Process CPU seconds total'),
process_max_fds: ::Gitlab::Metrics.gauge(with_prefix(:process, :max_fds), 'Process max fds'),
process_resident_memory_bytes: ::Gitlab::Metrics.gauge(with_prefix(:process, :resident_memory_bytes), 'Memory used (RSS)', labels),
process_unique_memory_bytes: ::Gitlab::Metrics.gauge(with_prefix(:process, :unique_memory_bytes), 'Memory used (USS)', labels),
process_proportional_memory_bytes: ::Gitlab::Metrics.gauge(with_prefix(:process, :proportional_memory_bytes), 'Memory used (PSS)', labels),
process_start_time_seconds: ::Gitlab::Metrics.gauge(with_prefix(:process, :start_time_seconds), 'Process start time seconds'),
sampler_duration: ::Gitlab::Metrics.counter(with_prefix(:sampler, :duration_seconds_total), 'Sampler time', labels),
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
metrics
end
def sample
start_time = System.monotonic_time
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metrics[:file_descriptors].set(labels, System.file_descriptor_count)
metrics[:process_cpu_seconds_total].set(labels, ::Gitlab::Metrics::System.cpu_time)
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
private
def sample_gc
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# Observe all GC samples
sample_gc_reports.each do |report|
metrics[:gc_duration_seconds].observe(labels, report[:GC_TIME])
end
# Collect generic GC stats
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GC.stat.each do |key, value|
metrics[key].set(labels, value)
end
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end
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def sample_gc_reports
GC::Profiler.enable
GC::Profiler.raw_data
ensure
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')
memory_uss_pss = System.memory_usage_uss_pss
metrics[:process_unique_memory_bytes].set(labels, memory_uss_pss[:uss])
metrics[:process_proportional_memory_bytes].set(labels, memory_uss_pss[:pss])
end
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end
end
end
end
end