ref(allocator): Try to use jemalloc for etl-api and etl-replicator

[iambriccardo]

This PR implements the tikv-jemallocator allocator for the etl-replicator and tweaks it for our workload.

[coveralls]

Pull Request Test Coverage Report for Build 19940349400

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 104 (0.0%) changed or added relevant lines in 2 files are covered.
• 129 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-0.6%) to 81.806%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
etl-replicator/src/main.rs	0	1	0.0%
etl-replicator/src/jemalloc_metrics.rs	0	103	0.0%

Files with Coverage Reduction	New Missed Lines	%
etl/src/workers/table_sync.rs	1	77.66%
etl/src/replication/table_sync.rs	2	82.43%
etl-api/src/configs/source.rs	5	96.3%
etl-api/src/routes/destinations_pipelines.rs	8	86.02%
etl-api/src/utils.rs	11	91.47%
etl-api/src/routes/sources/publications.rs	20	0.0%
etl-api/src/configs/destination.rs	28	91.87%
etl-api/src/k8s/http.rs	54	89.24%

Totals
Change from base Build 19892156494:	-0.6%
Covered Lines:	16501
Relevant Lines:	20171

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 19896703769

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 98 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-0.01%) to 82.372%

---

Files with Coverage Reduction	New Missed Lines	%
etl/src/pipeline.rs	2	81.56%
etl/src/types/event.rs	2	37.84%
etl/src/workers/table_sync.rs	2	77.41%
etl-postgres/src/tokio/test_utils.rs	6	85.96%
etl/src/test_utils/event.rs	8	80.77%
etl/src/test_utils/notify.rs	8	87.1%
etl/src/test_utils/test_destination_wrapper.rs	14	73.61%
etl/src/replication/client.rs	56	79.57%

Totals
Change from base Build 19892156494:	-0.01%
Covered Lines:	16453
Relevant Lines:	19974

---

💛 - Coveralls

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Using #[unsafe(export_name…)] prevents replicator build

The new jemalloc configuration statics use #[unsafe(export_name = "malloc_conf")], but unsafe is not a recognized attribute on stable Rust (only #[export_name = ...] is valid). On non‑MSVC targets this file is compiled for, the compiler rejects the attribute before linking jemalloc, so the replicator binary will not build with the workspace’s stable toolchain. Dropping unsafe or enabling the nightly unsafe_attributes feature is required for this code to compile.

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