Prometheus Go Exporter Demo

This demo aims to check whether the Collector Prometheus Exporter successfully sends cumulative metircs retrieved from the Go SDK.

Setup

Download OpenTelemetry Collector

Download Prometheus

Running

Run Prometheus

prometheus --config.file prometheus.yml

This commmand starts a Prometheus instance that scrapes from localhost:8800 once per second

Run OT Collector:

otel-col --config collector.config

This command starts a Collector instance that receives OTLP metrics and export the metric to Prometheus using the Prometheus exporter.

Generate Metric:

go run main.go

This command starts generating metric events from two counter and a valuerecorder instument, and sends metrics to the collector using Go SDK's OTLP exporter once per second.

Checking Values

Access the Prometheus dashboard at localhost:9090. Select the graph option and a_counter_1 or a_counter_i as the expression, then press Execute to see the updates. Note that the graph does not update automatically and that updates will not appear until the Prometheus instance says in the console that it is ready to begin retrieving data.