As specified in specs: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#periodic-exporting-metricreader
- This is an implementation of the MetricReader which collects metrics based on a user-configurable time interval, and passes it to the exporter
- Configurable parameters:
- exportIntervalMillis
- exportTimeoutMillis
As specified in specs: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#periodic-exporting-metricreader