Docs » Supported integrations in Splunk Observability Cloud » Configure application receivers for languages » Expvar (Go)

Expvar (Go) 🔗

The Splunk Distribution of OpenTelemetry Collector uses the Smart Agent receiver with the expvar monitor type to scrape metrics exposed Expvar. See expvar to learn more.

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 the memstats expvar variable. These memstat metrics are referred to as standard or default metrics and are exposed by default.

Benefits 🔗

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

Installation 🔗

Follow these steps to deploy this integration:

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

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

  3. Restart the Splunk Distribution of the OpenTelemetry Collector.

Configuration 🔗

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 🔗

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 🔗

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 trueand 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 “gauge” or

“cumulative”

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 🔗

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 🔗

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

  • In host-based subscription plans, default metrics are those metrics included in host-based subscriptions in Splunk 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 🔗

If you are a Splunk Observability Cloud customer and are not able to see your data in Splunk Observability Cloud, you can get help in the following ways.

Available to Splunk Observability Cloud customers

Available to prospective customers and free trial users

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

  • Join the Splunk #observability user group Slack channel to communicate with customers, partners, and Splunk employees worldwide. To join, see Chat groups in the Get Started with Splunk Community manual.

This page was last updated on Oct 07, 2024.