Track the memory usage of your Go services and collect metrics instrumented from Go’s expvar package.
If you prefer to instrument your Go code using only dogstats-go, you can still use this integration to collect memory-related metrics.
The Go Expvar check is packaged with the Agent, so install the Agent anywhere you run Go services to collect metrics.
Prepare the service
If your Go service doesn’t use the expvar package already, import it (import "expvar"). If you don’t want to instrument your own metrics with expvar - that is you only want to collect your service’s memory metrics - import the package using the blank identifier (import _ "expvar"). If your service doesn’t already listen for HTTP requests (with the http package), make it listen locally just for the Datadog Agent.
Note: The Go Expvar integration can potentially emit custom metrics, which may impact your billing. By default, there is a limit of 350 metrics. If you require additional metrics, contact Datadog support.