Go Expvar Integration
Overview
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.
Setup
Installation
The Go Expvar check is packaged with the Agent, so install the Agent anywhere you run Go services to collect metrics.
Configuration
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.
Host
To configure this check for an Agent running on a host:
Connect the Agent
-
Edit the file go_expvar.d/conf.yaml
, in the conf.d/
folder at the root of your Agent's configuration directory. See the sample go_expvar.d/conf.yaml for all available configuration options.
Note: If you don't configure a metrics
list, the Agent still collects memstat metrics. Use metrics
to tell the Agent which expvar vars to collect.
-
Restart the 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.
Containerized
For containerized environments, see the Autodiscovery Integration Templates for guidance on applying the parameters below.
Parameter |
Value |
<INTEGRATION_NAME> |
go_expvar |
<INIT_CONFIG> |
blank or {} |
<INSTANCE_CONFIG> |
{"expvar_url": "http://%%host%%:8080"} |
Validation
Run the Agent's status subcommand and look for go_expvar
under the Checks section.
Data Collected
Metrics
See metadata.csv for a list of metrics provided by this integration.
Events
The Go-Expvar check does not include any events.
Service Checks
The Go-Expvar check does not include any service checks.
Troubleshooting
Need help? Contact Datadog support.
Further Reading