An Expvar Receiver scrapes metrics from expvar, which exposes data in JSON format from an HTTP endpoint. The metrics are extracted from the expvar variable memstats, which exposes various information about the Go runtime.

By default, without any configuration, a request will be sent to http:https://localhost:8000/debug/vars every 60 seconds. The default configuration is achieved by the following:

receivers:
  expvar:

The following can be configured:

• Configure the HTTP client for scraping the expvar variables. The full set of configuration options for the client can be found in the core repo's confighttp.
  • defaults:
    • endpoint = http:https://localhost:8000/debug/vars
    • timeout = 3s
• collection_interval - Configure how often the metrics are scraped.
  • default: 1m
• initial_delay (default = 1s): defines how long this receiver waits before starting.
• metrics - Enable or disable metrics by name.

receivers:
  expvar:
    endpoint: "http:https://localhost:8000/custom/path"
    timeout: 1s
    collection_interval: 30s
    metrics:
      process.runtime.memstats.total_alloc:
        enabled: true
      process.runtime.memstats.mallocs:
        enabled: false