Stackdriver Monitoring custom metrics output plugin for Fluentd

$ gem install fluent-plugin-stackdriver-monitoring

See google-cloud-monitoring gem document.

Sample configuration is below.

<match your.tag>
  @type stackdriver_monitoring
  project {{PROJECT_NAME}}

  <custom_metrics>
    key {{KEY_NAME}}
    type custom.googleapis.com/{{METRICS_NAME}}
    metric_kind GAUGE
    value_type INT64
  </custom_metrics>

  flush_interval 1s  # must be 1(sec) or above
</match>

• project (string, required)
  • Set your Stackdriver project id.
• custom_metrics
  • key (string, required)
    • Specify field name in your log to send to Stackdriver.
  • type (string, required)
    • Set name of descriptor. It must start with custom.googleapis.com/.
  • metric_kind(enum, required)
    • See metric kind.
    • You can specify GAUGE or CUMULATIVE.
    • Custom metric does not support DELTA. See here.
  • value_type(enum, required)
    • See value type.
    • You can specify BOOL, INT64 or DOUBLE if metric_kind is GAUGE. And INT64 or DOUBLE can be specified if metric_kind is CUMULATIVE.
    • Custom metric does not support MONEY and STRING. See here.
  • time_interval(time, optional)
    • This param is used as the difference between start time and end time.
    • It must be greater than 0s if metric_kind is set to CUMULATIVE.

• Add test!
• Support Unit and Monitored Resource in custom_metrics.