Add environment variables for Periodic exporting MetricReader (#2038)

* add environment variables for Periodic exporting MetricReader * adjust format * update changelog * use user friendly name based on SIG discussion * update wording
open-telemetry · Oct 25, 2021 · 0f18f33 · 0f18f33
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -23,6 +23,8 @@ release.
   ([#1935](https://github.com/open-telemetry/opentelemetry-specification/pull/1935))
 - Add clarifications on how to handle numerical limits.
   ([#2007](https://github.com/open-telemetry/opentelemetry-specification/pull/2007))
+- Add environment variables for Periodic exporting MetricReader.
+  ([#2038](https://github.com/open-telemetry/opentelemetry-specification/pull/2038))
 
 ### Logs
 

diff --git a/specification/sdk-environment-variables.md b/specification/sdk-environment-variables.md
@@ -192,6 +192,13 @@ Known values for `OTEL_METRICS_EXEMPLAR_FILTER` are:
 - `"all"`: All measurements are eligible for exemplar sampling.
 - `"with_sampled_trace"`: Only allow measurements with a sampled parent span in context.
 
+### Periodic exporting MetricReader
+
+| Name                          | Description                                                                   | Default | Notes |
+| ----------------------------- | ----------------------------------------------------------------------------- | ------- | ----- |
+| `OTEL_METRIC_EXPORT_INTERVAL` | The time interval (in milliseconds) between the start of two export attempts. | 60000   |       |
+| `OTEL_METRIC_EXPORT_TIMEOUT`  | Maximum allowed time (in milliseconds) to export data.                        | 30000   |       |
+
 ## Language Specific Environment Variables
 
 To ensure consistent naming across projects, this specification recommends that language specific environment variables are formed using the following convention: