Docs » Available host and application monitors in Splunk Observability Cloud » Configure application receivers for languages » Expvar (Go)

Expvar (Go) πŸ”—

The Splunk Distribution of OpenTelemetry Collector uses the Smart Agent receiver with the expvar monitor type to scrape metrics exposed by expvar

The integration uses configured paths to get metric and dimension values from fetched JSON objects at an HTTP endpoint. The Metrics section in this document shows metrics derived from expvar variable memstats, which is exposed by default. These memstat metrics are referred to as standard or default metrics.

Benefits πŸ”—

After you configure the integration, you can access these features:

Installation πŸ”—

Follow these steps to deploy this integration:

  1. Deploy the Splunk Distribution of OpenTelemetry Collector to your host or container platform:

  2. Configure the monitor, as described in the Configuration section.

  3. Restart the Splunk Distribution of OpenTelemetry Collector.

Configuration πŸ”—

To use this integration of a Smart Agent monitor with the Collector:

  1. Include the Smart Agent receiver in your configuration file.

  2. Add the monitor type to the Collector configuration, both in the receiver and pipelines sections.

Example πŸ”—

To activate this integration, add the following to your Collector configuration:

receivers:
  smartagent/expvar:
    type: expvar
    ... # Additional config

Next, add the monitor to the service.pipelines.metrics.receivers section of your configuration file:

service:
  pipelines:
    metrics:
      receivers: [smartagent/expvar]

Configuration settings πŸ”—

The following tables show the configuration options for this monitor:

Option

Required

Type

Description

host

yes

string

Host of the expvar endpoint

port

yes

integer

Port of the expvar endpoint

useHTTPS

no

bool

If true, the agent will connect to the host using HTTPS instead of plain HTTP. (default: false)

skipVerify

no

bool

If useHTTPS is true and this option is also true, the host TLS cert will not be verified. (default: false)

path

no

string

Path to the expvar endpoint, usually /debug/vars (the default). (default: /debug/vars)

enhancedMetrics

no

bool

If true, sends metrics memstats.alloc, memstats.by_size.size, memstats.by_size.mallocs and memstats.by_size.frees (default: false)

metrics

no

list of objects (see below)

Metrics configurations

The nested metrics configuration object has the following fields:

Option

Required

Type

Description

name

no

string

Metric name

JSONPath

yes

string

JSON path of the metric value

type

yes

string

SignalFx metric type. Possible values are β€œgauge” or β€œcumulative”

dimensions

no

list of objects (see below)

Metric dimensions

pathSeparator

no

string

Path separator character of metric value in JSON object (default: .)

The nested dimensions configuration object has the following fields:

Option

Required

Type

Description

name

yes

string

Dimension name

JSONPath

no

string

JSON path of the dimension value

value

no

string

Dimension value

Metrics πŸ”—

Do not configure the monitor for memstats metrics because they are standard metrics provided by default. The following metrics are also available for this integration:

Notes πŸ”—

  • To learn more about the available in Observability Cloud see Metric types.

  • In host-based subscription plans, default metrics are those metrics included in host-based subscriptions in Observability Cloud, such as host, container, or bundled metrics. Custom metrics are not provided by default and might be subject to charges. See Metric categories for more information.

  • In MTS-based subscription plans, all metrics are custom.

  • To add additional metrics, see how to configure extraMetrics in Add additional metrics.

Troubleshooting πŸ”—

If you are not able to see your data in Splunk Observability Cloud, try these tips:

  • Submit a case in the Splunk Support Portal.

    • Available to Splunk Observability Cloud customers

  • Call Splunk Customer Support

    • Available to Splunk Observability Cloud customers

  • Ask a question and get answers through community support at Splunk Answers.

    • Available to Splunk Observability Cloud customers and free trial users

  • Join the Splunk #observability user group Slack channel to communicate with customers, partners, and Splunk employees worldwide

To learn about even more support options, see Splunk Customer Success.