Enhance Datadog Integration Docs: Add serviceMetric Resource

[phalbert]

Description

This pull request enhances the documentation for the Datadog integration by adding information about the new serviceMetric resource. This resource allows users to fetch specific metrics from Datadog using a variety of filters, providing more flexibility and control over the data ingested into Port.

Key Changes:

• New Section on serviceMetric Resource: A new section is added to the Datadog integration documentation, explaining the purpose and usage of the serviceMetric resource.
• Configuration Examples: Clear configuration examples are provided, demonstrating how to use the datadogSelector to filter metrics based on metric, env, service, and timeframe.
• Explanation of Mapping: The mapping between the Datadog response and the Port entity is explained, including the use of properties like __query_id, __query, __metric, __env, and __service.

Updated docs pages

Please also include the path for the updated docs

• Datadog Ocean (build-your-software-catalog/sync-data-to-catalog/apm-alerting/datadog)

[aws-amplify-eu-west-1]

This pull request is automatically being deployed by Amplify Hosting (learn more).

Access this pull request here: https://pr-1502.d2ngvl90zqbob8.amplifyapp.com