Class: Fluent::PrometheusMonitorInput

Inherits:
Input
  • Object
show all
Defined in:
lib/fluent/plugin/in_prometheus_monitor.rb

Defined Under Namespace

Classes: TimerWatcher

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ PrometheusMonitorInput

Returns a new instance of PrometheusMonitorInput.



12
13
14
15
 
# File 'lib/fluent/plugin/in_prometheus_monitor.rb', line 12

def initialize
  super
  @registry = ::Prometheus::Client.registry
end

Instance Attribute Details

#registry ⇒ Object (readonly)

Returns the value of attribute registry.



10
11
12
 
# File 'lib/fluent/plugin/in_prometheus_monitor.rb', line 10

def registry
  @registry
end

Instance Method Details

#configure(conf) ⇒ Object 



17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
 
# File 'lib/fluent/plugin/in_prometheus_monitor.rb', line 17

def configure(conf)
  super
  hostname = Socket.gethostname
  expander = Fluent::Prometheus.placeholder_expander(log)
  placeholders = expander.prepare_placeholders({'hostname' => hostname})
  @base_labels = Fluent::Prometheus.parse_labels_elements(conf)
  @base_labels.each do |key, value|
    @base_labels[key] = expander.expand(value, placeholders)
  end

  if defined?(Fluent::Plugin) && defined?(Fluent::Plugin::MonitorAgentInput)
    # from v0.14.6
    @monitor_agent = Fluent::Plugin::MonitorAgentInput.new
  else
    @monitor_agent = Fluent::MonitorAgentInput.new
  end

  buffer_queue_length = @registry.gauge(
    :fluentd_status_buffer_queue_length,
    'Current buffer queue length.')
  buffer_total_queued_size = @registry.gauge(
    :fluentd_status_buffer_total_bytes,
    'Current total size of queued buffers.')
  retry_counts = @registry.gauge(
    :fluentd_status_retry_count,
    'Current retry counts.')

  @monitor_info = {
    'buffer_queue_length' => buffer_queue_length,
    'buffer_total_queued_size' => buffer_total_queued_size,
    'retry_count' => retry_counts,
  }
end

#labels(plugin_info) ⇒ Object 



98
99
100
101
102
103
104
 
# File 'lib/fluent/plugin/in_prometheus_monitor.rb', line 98

def labels(plugin_info)
  @base_labels.merge(
    plugin_id: plugin_info["plugin_id"],
    plugin_category: plugin_info["plugin_category"],
    type: plugin_info["type"],
  )
end

#run ⇒ Object 



81
82
83
84
85
86
 
# File 'lib/fluent/plugin/in_prometheus_monitor.rb', line 81

def run
  @loop.run
rescue
  log.error "unexpected error", :error=>$!.to_s
  log.error_backtrace
end

#shutdown ⇒ Object 



74
75
76
77
78
79
 
# File 'lib/fluent/plugin/in_prometheus_monitor.rb', line 74

def shutdown
  super
  @loop.watchers.each {|w| w.detach }
  @loop.stop
  @thread.join
end

#start ⇒ Object 



66
67
68
69
70
71
72
 
# File 'lib/fluent/plugin/in_prometheus_monitor.rb', line 66

def start
  super
  @loop = Coolio::Loop.new
  @timer = TimerWatcher.new(@interval, true, log, &method(:update_monitor_info))
  @loop.attach(@timer)
  @thread = Thread.new(&method(:run))
end

#update_monitor_info ⇒ Object 



88
89
90
91
92
93
94
95
96
 
# File 'lib/fluent/plugin/in_prometheus_monitor.rb', line 88

def update_monitor_info
  @monitor_agent.plugins_info_all.each do |info|
    @monitor_info.each do |name, metric|
      if info[name]
        metric.set(labels(info), info[name])
      end
    end
  end
end