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# frozen_string_literal: true
require 'prometheus/client/support/unicorn'
module Gitlab
module Metrics
module Samplers
class RubySampler < BaseSampler
GC_REPORT_BUCKETS = [0.001, 0.002, 0.005, 0.01, 0.05, 0.1, 0.5].freeze
def initialize(interval)
GC::Profiler.clear
metrics[:process_start_time_seconds].set(labels, Time.now.to_i)
super
end
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
metrics = {
file_descriptors: ::Gitlab::Metrics.gauge(with_prefix(:file, :descriptors), 'File descriptors used', labels),
memory_bytes: ::Gitlab::Metrics.gauge(with_prefix(:memory, :bytes), 'Memory 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', 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)
}
GC.stat.keys.each do |key|
metrics[key] = ::Gitlab::Metrics.gauge(with_prefix(:gc_stat, key), to_doc_string(key), labels)
end
metrics
end
def sample
start_time = System.monotonic_time
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)
set_memory_usage_metrics
sample_gc
metrics[:sampler_duration].increment(labels, System.monotonic_time - start_time)
end
private
def sample_gc
# Observe all GC samples
sample_gc_reports.each do |report|
metrics[:gc_duration_seconds].observe(labels, report[:GC_TIME])
end
# Collect generic GC stats
GC.stat.each do |key, value|
metrics[key].set(labels, value)
end
end
def sample_gc_reports
GC::Profiler.enable
GC::Profiler.raw_data
ensure
GC::Profiler.clear
end
def set_memory_usage_metrics
memory_usage = System.memory_usage
metrics[:memory_bytes].set(labels, memory_usage)
metrics[:process_resident_memory_bytes].set(labels, memory_usage)
end
end
end
end
end
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