Emit pool metrics, fix Count semantics, and add an async idle fast path - #4504

Draft

mdaigle wants to merge 46 commits into

dev/automation/channel-pool-v2-parityfrom

dev/automation/channel-pool-v2-followups

Commits on Jul 13, 2026

Add connection-creation rate limiting to ChannelDbConnectionPool
mdaigle
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d3e2fe7

Commits on Jul 14, 2026

Narrow pool rate limiter to ConcurrencyLimiter

mdaigle
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Copilot
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4396432
Replace rate-limit TODOs with rationale comment

mdaigle
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Copilot
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86b4b2a
Remove rate-limit TODOs from AttemptAcquire call

mdaigle
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Copilot
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144a324
Merge remote-tracking branch 'origin/main' into dev/mdaigle/pool-channel-rate-limiting
mdaigle
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029ce7e
Inline leaseAcquired into lease.IsAcquired checks

mdaigle
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Copilot
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662b36d
Add test that successful create releases its rate-limiter lease

mdaigle
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Copilot
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87c8631
Add test for lease-release wake path (FR-004)

mdaigle
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Copilot
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19948c2
Address Copilot review: OCE handling, redundant wake, docs, test disposal

mdaigle
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Copilot
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0d60cd4

Commits on Jul 15, 2026

Remove instance-level ForceNewConnection property. Replace with explicit method parameters.
mdaigle
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9b91a45
Fix initialization. Add doc comments.
mdaigle
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08d24b3
Remove unnecessary internal API surface.
mdaigle
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08eff42
Expose param.
mdaigle
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e350b42
Address broken test and copilot comments.
mdaigle
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e2e1a72
WIP
mdaigle
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63edefe
Add unit tests.
mdaigle
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949d9b2
Wording
mdaigle
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d684191
improve error handling
mdaigle
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23cfa38
Address copilot comments.
mdaigle
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ae75925
Fix malformed XML doc comment in TryOpenInner remarks

mdaigle
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Copilot
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b266402
Prefer reusing an idle connection in ChannelDbConnectionPool.ReplaceConnection

mdaigle
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Copilot
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88aaffd
Use named forceNewConnection arguments at literal call sites

mdaigle
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Copilot
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19933e7
Return reused connection to the pool on activation failure via PrepareConnection

mdaigle
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Copilot
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ea77190
Condense block comments in ReplaceConnection

mdaigle
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Copilot
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e573441
Document ReplaceConnection design rationale in one header block

mdaigle
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Copilot
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594231c
Merge remote-tracking branch 'origin/main' into dev/mdaigle/pool-channel-rate-limiting

mdaigle
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Copilot
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36e0a51
Merge branch 'dev/mdaigle/pool-channel-rate-limiting' into dev/mdaigle/replace-conn-2

mdaigle
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Copilot
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f7f7f63
Restore named forceNewConnection arguments at test call sites

mdaigle
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Copilot
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69b08b5
clean up comments
mdaigle
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fbf37d7
Merge branch 'dev/mdaigle/replace-conn-2' of https://github.com/dotnet/SqlClient into dev/mdaigle/replace-conn-2
mdaigle
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0d19e4e

Commits on Jul 16, 2026

Commits on Jul 27, 2026

Merge remote-tracking branch 'origin/main' into dev/mdaigle/replace-conn-2

mdaigle
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Copilot
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418bf53
Address Copilot review feedback on ReplaceConnection

mdaigle
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Copilot
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5ca5fc8

Commits on Jul 28, 2026

Throw localized message when pool connection replacement fails

mdaigle
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Copilot
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ef4754f
Explain why replacement bypasses the connection-creation rate limiter

mdaigle
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Copilot
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c50865c
Inject FakeTimeProvider in new pool tests to prevent background races

mdaigle
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Copilot
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36c309b
Merge origin/main into dev/mdaigle/replace-conn-2

mdaigle
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Copilot
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7b9e36b
Enter blocking-period error state on replacement open failure

mdaigle
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Copilot
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8736037

Commits on Jul 29, 2026

Address Paul's review feedback

mdaigle
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Copilot
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1f1e766
Implement transaction support in ChannelDbConnectionPool

mdaigle
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Copilot
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c8e7f11
Flow the ambient transaction explicitly on the async open path

mdaigle
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Copilot
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c540496

Commits on Aug 4, 2026

Reclaim emancipated connections in ChannelDbConnectionPool

mdaigle
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Copilot
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ca8079b
Emit pool metrics, fix Count semantics, and add an async idle fast path

mdaigle
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Copilot
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ebe1433