[exporter/datadog] Add configurable reporter_period for host metadata

[NassimBtk]

Description

This pull request introduces a new configurable parameter reporter_period for the Datadog exporter’s host metadata configuration. This enhancement allows users to specify the frequency at which host metadata is sent to Datadog. The changes span multiple files and include updates to configuration, factory methods, and test cases.

Enhancements to Datadog exporter:

• .chloggen/add-configurable-reporter-period-for-host-metadata.yaml: Added a changelog entry for the new reporter_period parameter.
• exporter/datadogexporter/examples/collector.yaml: Added documentation for the new reporter_period parameter in the example configuration file.
• exporter/datadogexporter/factory.go: Updated the factory to use the reporter_period from the configuration instead of a hardcoded value.

Configuration updates:

• exporter/datadogexporter/internal/hostmetadata/config.go: Added ReporterPeriod to the PusherConfig struct.
• pkg/datadog/config/config.go: Added validation for the reporter_period to ensure it is a positive duration and set a default value. [1] [2]

Test case updates:

• exporter/datadogexporter/factory_test.go, exporter/datadogexporter/logs_exporter_test.go, exporter/datadogexporter/metrics_exporter_test.go, exporter/datadogexporter/traces_exporter_test.go: Updated test cases to include the new reporter_period parameter. [1] [2] [3] [4]
• pkg/datadog/config/config_test.go: Added test cases to validate the reporter_period configuration. [1] [2]

  Link to tracking issue

  Fixes #36450

Testing

Documentation