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# Feature Gates
The runtime package contains a feature gate used to ease the migration
from the [previous runtime metrics conventions] to the new [OpenTelemetry Go
Runtime conventions].
Note that the new runtime metrics conventions are still experimental, and may
change in backwards incompatible ways as feedback is applied.
## Features
- [Include Deprecated Metrics](#include-deprecated-metrics)
### Include Deprecated Metrics
To temporarily re-enable the deprecated metrics:
```console
export OTEL_GO_X_DEPRECATED_RUNTIME_METRICS=true
```
Eventually, the deprecated runtime metrics will be removed,
and setting the environment variable will no longer have any effect.
The value set must be the case-insensitive string of `"true"` to enable the
feature, and `"false"` to disable the feature. All other values are ignored.
[previous runtime metrics conventions]: https://pkg.go.dev/go.opentelemetry.io/contrib/instrumentation/runtime@v0.52.0
[OpenTelemetry Go Runtime conventions]: https://github.com/open-telemetry/semantic-conventions/blob/main/docs/runtime/go-metrics.md
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