Stephen Wakely

Have updated to Halogen v5. The main change is ElemSpec is no longer used, its params are now passed directly to Elem. I have also updated the test and example...

enhancement(datadog_agent source): enable zstd decompression

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The datadog agent is in the process of allowing payloads to be compressed with `zstd`. This adds the ability to Vector to handle these.

Install different allocators

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### What does this PR do? ### Motivation ### Additional Notes ### Possible Drawbacks / Trade-offs ### Describe how to test/QA your changes

`zstd` with a custom allocator

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### What does this PR do? ### Motivation ### Describe how to test/QA your changes ### Possible Drawbacks / Trade-offs ### Additional Notes

[APR-210] Zstd logs with added telemetry

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APR-210 A branch of #27149 to do some benchmarking with. I have added extra telemetry and added an option to compress using a native golang zstd library. ### What does...

Tag Aggregation

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### What does this PR do? ### Motivation ### Describe how you validated your changes ### Additional Notes