Language Runtime Metrics

Last updated September 03, 2026

To provide additional insights into memory health we offer optional language-specific runtime metrics. JVM, Go (public beta), Node.js (public beta), and Ruby (public beta) are currently supported.

This feature only works for apps that use classic buildpacks. Subscribe to our changelog to stay informed of when we add this feature to apps using Cloud Native Buildpacks.

General Information

For all metrics the resolution is dependent on the timeframe selected. More information on metrics retention and resolution is available in the Application Metrics docs.

Language runtime metrics are available for all dynos using the supported languages, except for eco or fir dynos.

Setup Instructions

First, enable the Language Metrics flag on your application via the dashboard or the CLI. To enable it through dashboard, open the metrics preferences panel and turn on the Enhanced Language Metrics toggle:

languageMetricsToggle

Alternatively, enable it through the Heroku CLI:

$ heroku labs:enable "runtime-heroku-metrics" -a "my-app-name"

This toggle tells our metrics collection backend to collect and report any language specific metrics that are exported by your application. Depending on the language, there can be some additional steps you must take to have these metrics exported to our data collection service.

See the language-specific documentation for detailed instructions on exporting your metrics and for more information regarding our available metrics:

Using with Pipelines

To use language runtime metrics with Heroku Pipelines, you must follow the setup instructions for the most downstream app in the pipeline (the one you deploy to before promoting). Then you must enable the feature in the metrics dashboard of any upstream apps in the pipeline before promoting.

If your downstream app is an Eco-tier app, you must follow all of the setup instructions except enabling the feature in the metrics dashboard. For example, you must still add a buildpack or a new dependency to the app. The feature doesn’t work on the Eco app, but any other dyno types downstream can use the feature after you promote.

Sample Metrics

jvmmetrics1

goMetrics

Disabling Metrics Collection

If for any reason you want to stop data collection for additional languages, toggle off the Enhanced Language Metrics toggle via the metrics preferences panel, or by using this CLI command:

$ heroku labs:disable "runtime-heroku-metrics" -a "my-app-name"

Keep in mind that there are gaps in metrics data for any time period that this flag is disabled.