OpenCensus and OpenTracing have merged into OpenTelemetry!

Prometheus

Introduction

The OpenCensus Service allows you to export metrics that are collected to Prometheus.

Configuration

In the Service’s YAML configuration file, under section “exporters” and sub-section “prometheus”

Format

With these fields below

exporters:
  prometheus:
    namespace: "<namespace>"
    address: "<port:host>"
    const_labels: {
        "<key1>":"<value1>",
        "<key2>":"<value2>"
    }

End to end example

In this end-to-end example, we’ll have the OpenCensus Service running and a couple of Go applications that use the Go ocagent-exporter to send over metrics and traces to the OpenCensus Service

Running OpenCensus Service

On starting the OpenCensus Service with the configuration below:

exporters:
  prometheus:
    namespace: "promdemo"
    address: "localhost:8888"
    const_labels: {
        "vendor": "otc"
    }

Running Prometheus

As specified above in Running OpenCensus Service by “address”: “localhost:9090”, please have your Prometheus server running by also configuring its configuration file prom.yaml

# Saved into prom.yaml
scrape_configs:
  - job_name: 'agent1'
    scrape_interval: 5s
    static_configs:
      - targets: ['localhost:8888']

and then running Prometheus

prometheus --config.file=prom.yaml

Running Application Code

And then running the ocagent-go-exporter main.go application

The ocagent.WithAddress can be changed in main.go to point to the OpenCensus Collector directly if desired.

$ GO111MODULE=on go run example/main.go
#0: LineLength: 469By
#1: LineLength: 794By
Latency: 132.649ms
#0: LineLength: 448By
#1: LineLength: 420By
#2: LineLength: 486By
#3: LineLength: 473By
Latency: 1066.808ms

Results

On navigating to the Prometheus UI at http://localhost:9090

All metrics

Rates for individual line length buckets

p99th latencies

Rates for line counts

References

Resource URL
Prometheus project home https://prometheus.io
Go ocagent-exporter demo ocagent-demo