[v0y4g3r]

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Refer to a related PR or issue link (optional)

• Backports test: cover request-level insert WAL skipping end to end #9093 (ordinary-insert protocol/COPY/session coverage) and feat: support request-level WAL skipping for bulk inserts #9110 (request-level bulk WAL skipping) to release/5e02efa9, in separate commits.
• feat: support request-level insert WAL skipping #9088 is already in the target branch.
• Merge this prerequisite before updating the fix(mito): flush memtables containing skip-WAL writes on region close #9440 close-flush backport (fix(mito): backport skip-WAL close flush to release/5e02efa9 #9625).
• The separate WAL re-enabling feature feat: allow re-enabling WAL after disabling #9130 is not included.

What's changed and what's your intention?

Restore the missing skip-WAL prerequisites rather than maintaining a reduced close-flush backport around their absence.

The first commit copies #9093's integration harness and tests without functional changes. The second ports #9110: forwards the insert_skip_wal hint through Flight DoPut and bulk region RPCs, keeps different WAL policies in separate pending Prometheus batches, and skips bulk WAL entry construction while retaining memtable writes, sequence assignment, and completion notifications. Metric metadata writes remain WAL-backed. The proto dependency advances to the original #9110 revision 0c4beffaa2b3968034915867593a717c6ab0c6b4 (greptime-proto#339).

Release-specific adaptations

The release branch already has the newer shared write dispatcher and partition-column preservation backports. Preserve them instead of restoring main's older direct-dispatch code:

• Carry skip_wal on both initial bulk dispatch paths and through request rebuilding after partition-route changes.
• Add true/false policy assertions to the existing bulk repartition/unchanged-route regression.
• Keep partition versions and physical partition columns in pending batcher requests, alongside the new policy flag.
• Retain the physical bulk partition-column regression and exercise both WAL policies.
• Initialize the new field in release-only staging/dispatcher test fixtures.

No persisted WAL/schema encoding changes. The additive protobuf flag defaults to false when omitted. Skip-WAL data remains vulnerable to loss before flush; this PR does not include the close-flush change from #9440.

Validation

• test: cover request-level insert WAL skipping end to end #9093 alone: focused skip-WAL protocol/COPY integration selection, 27 passed.
• Combined affected packages (client, frontend, operator, servers, store-api, mito2, metric-engine) plus skip-WAL/Flight integration selection: 2491 passed, 810 filtered/ignored tests not run.
• cargo sqlness bare -t '(session_skip_wal|copy_skip_wal)': 3 cases passed (session in standalone/distributed, COPY in standalone). Result files remain identical to the upstream-generated snapshots.
• Affected-package Clippy with --all-targets --no-deps -- -D warnings: passed.
• Formatting and locked metadata passed. Source diff checks pass; the two unchanged upstream-generated .result snapshots retain their terminal blank lines.

Full workspace tests, cross-version compatibility runs, and external-service Kafka runs were not executed. The distributed integration harness uses in-process services, not process-crash experiments.

PR Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.
• This PR needs to be backported to release branches, and I have added the backport-<target> labels (e.g. backport-v1.3 targets release/v1.3).

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[github-actions]

Warning

@v0y4g3r has 6 open non-draft pull requests in this repository, over the limit of 5.

Review is the scarcest resource here. Please land or close some of these before
pushing this one forward.

• PR 9539: fix(mito2): avoid excessive overlap-only compaction rewrites
• PR 9597: refactor(mito): avoid pinning region version when rebuilding indexes
• PR 9624: chore: backport rustls 0.23.46 to release/5e02efa9
• PR 9625: fix(mito): backport skip-WAL close flush to release/5e02efa9
• PR 9626: feat(auth): expose public authentication config

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