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[receiver/datadog] Implement '/stats' endpoint (#34790)
**Description:** <Describe what has changed.> Following up on #34772, this PR implements Datadog Agent's `/stats` endpoint, which is used for sending [client stats](https://github.com/DataDog/dd-trace-java/blob/master/communication/src/main/java/datadog/communication/ddagent/DDAgentFeaturesDiscovery.java#L40) of the [local sampled spans](https://github.com/DataDog/dd-trace-java/blob/master/dd-trace-core/src/main/java/datadog/trace/core/CoreTracer.java#L993-L1008) to calculate the [trace metrics](https://docs.datadoghq.com/tracing/metrics/metrics_namespace/). This PR also does a minor refactor in the usage of Datadog's common headers, moving from literal strings to centralized constants. **Link to tracking Issue:** <Issue number if applicable> **Testing:** <Describe what testing was performed and which tests were added.> **Documentation:** <Describe the documentation added.>
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| # Use this changelog template to create an entry for release notes. | ||
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| # One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix' | ||
| change_type: enhancement | ||
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| # The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver) | ||
| component: datadogreceiver | ||
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| # A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`). | ||
| note: Implement '/stats' endpoint | ||
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| # Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists. | ||
| issues: [34790] | ||
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| # (Optional) One or more lines of additional information to render under the primary note. | ||
| # These lines will be padded with 2 spaces and then inserted directly into the document. | ||
| # Use pipe (|) for multiline entries. | ||
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| # If your change doesn't affect end users or the exported elements of any package, | ||
| # you should instead start your pull request title with [chore] or use the "Skip Changelog" label. | ||
| # Optional: The change log or logs in which this entry should be included. | ||
| # e.g. '[user]' or '[user, api]' | ||
| # Include 'user' if the change is relevant to end users. | ||
| # Include 'api' if there is a change to a library API. | ||
| # Default: '[user]' | ||
| change_logs: [] |
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