Elastic APM is an application performance monitoring product Elastic, the makers of Elasticsearch, and most notably the ELK stack (Elasticsearch, Logstash, Kibana). APM is another plug and play product of theirs, that hooks up to your existing ELK installation and provides endpoints for application agents to receive performance metrics data.

Elastic APM provides a Go agent, which we will use to instrument various parts of our code. The instrumentation will help us not only with performance...