Class: PrometheusExporter::Instrumentation::Process

Inherits:
Object
  • Object
show all
Defined in:
lib/prometheus_exporter/instrumentation/process.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(metric_labels) ⇒ Process

Returns a new instance of Process.



43
44
45
46
 
# File 'lib/prometheus_exporter/instrumentation/process.rb', line 43

def initialize(metric_labels)
  @metric_labels = metric_labels
  @hostname = nil
end

Class Method Details

.start(client: nil, type: "ruby", frequency: 30, labels: nil) ⇒ Object 



6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
 
# File 'lib/prometheus_exporter/instrumentation/process.rb', line 6

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

.stop ⇒ Object 



36
37
38
39
40
41
 
# File 'lib/prometheus_exporter/instrumentation/process.rb', line 36

def self.stop
  if t = @thread
    t.kill
    @thread = nil
  end
end

Instance Method Details

#collect ⇒ Object 



58
59
60
61
62
63
64
65
66
67
 
# File 'lib/prometheus_exporter/instrumentation/process.rb', line 58

def collect
  metric = {}
  metric[:type] = "process"
  metric[:metric_labels] = @metric_labels
  metric[:hostname] = hostname
  collect_gc_stats(metric)
  collect_v8_stats(metric)
  collect_process_stats(metric)
  metric
end

#collect_gc_stats(metric) ⇒ Object 



84
85
86
87
88
89
90
91
 
# File 'lib/prometheus_exporter/instrumentation/process.rb', line 84

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

#collect_process_stats(metric) ⇒ Object 



78
79
80
81
82
 
# File 'lib/prometheus_exporter/instrumentation/process.rb', line 78

def collect_process_stats(metric)
  metric[:pid] = pid
  metric[:rss] = rss

end

#collect_v8_stats(metric) ⇒ Object 



93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
 
# File 'lib/prometheus_exporter/instrumentation/process.rb', line 93

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

#hostname ⇒ Object 



48
49
50
51
52
53
54
55
56
 
# File 'lib/prometheus_exporter/instrumentation/process.rb', line 48

def hostname
  @hostname ||=
    begin
      `hostname`.strip
    rescue => e
      STDERR.puts "Unable to lookup hostname #{e}"
      "unknown-host"
    end
end

#pid ⇒ Object 



69
70
71
 
# File 'lib/prometheus_exporter/instrumentation/process.rb', line 69

def pid
  @pid = ::Process.pid
end

#rss ⇒ Object 



73
74
75
76
 
# File 'lib/prometheus_exporter/instrumentation/process.rb', line 73

def rss
  @pagesize ||= `getconf PAGESIZE`.to_i rescue 4096
  File.read("/proc/#{pid}/statm").split(' ')[1].to_i * @pagesize rescue 0
end