[litianningdatadog]

What does this PR do?

Each batch is compressed at most once (per-batch OnceLock) and the same bytes are reused for the primary and every additional endpoint. The bytes sent don't change.

Motivation

Part of SVLS-8713: bottlecap (the Datadog Lambda Extension) is replacing its own logs aggregator and flusher with this crate. Two rules for the whole stack:

• Nothing changes for existing users of this crate (for example serverless-compat): every new behavior is opt-in, defaults and public API stay the same (additions only), no new environment variables, no new dependencies.
• Nothing changes for Lambda users: the options let bottlecap reproduce its current behavior exactly.

The flusher compressed the same batch again for every endpoint; with additional endpoints that multiplies CPU work, which matters on small Lambda functions.

Additional Notes

None.

Describe how to test/QA your changes

111 tests pass (new: primary and extras receive identical bytes equal to compressing once; each batch in a multi-batch flush is still compressed on its own).

Stack

Each PR is nested under the PR it builds on (and targets). Review and merge from the top down.

serverless-components (datadog-logs-agent options; merge first)

• main
  • [SVLS-8713] test(logs-agent): pin current default behavior with characterization tests #189 characterization tests (pin today's defaults)
    • [SVLS-8713] build(logs-agent): let users choose the FIPS TLS backend #190 default / fips features
      • [SVLS-8713] feat(logs-agent): accept pre-serialized logs and an oversize policy #191 pre-serialized logs + oversize policy
        • [SVLS-8713] feat(logs-agent): optional API key resolver and Datadog intake URL override #192 API key resolver + intake URL override
          • [SVLS-8713] feat(logs-agent): add a retry-only method and an optional flush policy #193 retry() + FlushPolicy
            • 👉 [SVLS-8713] perf(logs-agent): compress each log batch only once #194 compress each batch once ← this PR
              • [SVLS-8713] perf(logs-agent): compress log batches before waiting for the API key #195 compress before waiting for the API key

datadog-lambda-extension (bottlecap)

• main
  • [SVLS-8713] test(logs): contract tests, fake logs intake and benchmark for the logs pipeline datadog-lambda-extension#1448 contract tests, fake intake, benchmark
    • [SVLS-8713] fix(logs): send additional endpoints the Datadog intake format when OPW is on datadog-lambda-extension#1449 fix: OPW applies only to the primary endpoint
      • [SVLS-8713] fix(logs): drop a log too large for any payload instead of blocking the queue datadog-lambda-extension#1450 fix: drop a log too large for any payload
        • [SVLS-8713] test(logs): pin that a reloaded API key is used on the next flush datadog-lambda-extension#1451 pin: reloaded API key is used
          • bc-1: use the shared aggregator (opens after the serverless-components PRs merge)
            • bc-2: use the shared flusher (opens after the serverless-components PRs merge)

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