/
process.rb
100 lines (84 loc) · 2.54 KB
/
process.rb
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# frozen_string_literal: true
# collects stats from currently running process
module PrometheusExporter::Instrumentation
class Process
def self.start(client: nil, type: "ruby", frequency: 30, labels: nil)
metric_labels =
if labels && type
labels.merge(type: type)
elsif labels
labels
else
{ type: type }
end
process_collector = new(metric_labels)
client ||= PrometheusExporter::Client.default
stop if @thread
@thread = Thread.new do
while true
begin
metric = process_collector.collect
client.send_json metric
rescue => e
STDERR.puts("Prometheus Exporter Failed To Collect Process Stats #{e}")
ensure
sleep frequency
end
end
end
end
def self.stop
if t = @thread
t.kill
@thread = nil
end
end
def initialize(metric_labels)
@metric_labels = metric_labels
end
def collect
metric = {}
metric[:type] = "process"
metric[:metric_labels] = @metric_labels
metric[:hostname] = ::PrometheusExporter.hostname
collect_gc_stats(metric)
collect_v8_stats(metric)
collect_process_stats(metric)
metric
end
def pid
@pid = ::Process.pid
end
def rss
@pagesize ||= `getconf PAGESIZE`.to_i rescue 4096
File.read("/proc/#{pid}/statm").split(' ')[1].to_i * @pagesize rescue 0
end
def collect_process_stats(metric)
metric[:pid] = pid
metric[:rss] = rss
end
def collect_gc_stats(metric)
stat = GC.stat
metric[:heap_live_slots] = stat[:heap_live_slots]
metric[:heap_free_slots] = stat[:heap_free_slots]
metric[:major_gc_ops_total] = stat[:major_gc_count]
metric[:minor_gc_ops_total] = stat[:minor_gc_count]
metric[:allocated_objects_total] = stat[:total_allocated_objects]
end
def collect_v8_stats(metric)
return if !defined? MiniRacer
metric[:v8_heap_count] = metric[:v8_heap_size] = 0
metric[:v8_heap_size] = metric[:v8_physical_size] = 0
metric[:v8_used_heap_size] = 0
ObjectSpace.each_object(MiniRacer::Context) do |context|
stats = context.heap_stats
if stats
metric[:v8_heap_count] += 1
metric[:v8_heap_size] += stats[:total_heap_size].to_i
metric[:v8_used_heap_size] += stats[:used_heap_size].to_i
metric[:v8_physical_size] += stats[:total_physical_size].to_i
end
end
end
end
end