Add Cosmos hedging detection API + observability surfacing - #4871

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Nalu Tripician (NaluTripician) wants to merge 30 commits into

NaluTripician:cosmos-hedge-obs

Commits on Jul 27, 2026

Add Cosmos hedging detection API to driver

Nalu Tripician
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d158482
Surface hedging through Cosmos observability handlers

Nalu Tripician
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a33d7df
Fix hedge-race region attribution + observability consistency

Nalu Tripician (NaluTripician)
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f861e99
Make hedge observability surfaces consistent for both-transient→failover

Nalu Tripician (NaluTripician)
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a47bc86
Fix broken links in hedging detection API spec

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d9f1881
Documentation cleanups from round-3 review

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Nalu Tripician
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eb79114
Align hedge_diagnostics() docstring with hedging_started()

Nalu Tripician (NaluTripician)
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Copilot
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d9ab7b8

Commits on Jul 28, 2026

Merge main; materialize hedge region history

Nalu Tripician
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df8b9df
Report hedge fan-out consistently across observability

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b81bf39
Fix broken intra-doc link in metrics handler

Nalu Tripician
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87e305a
Add fanouts and undercount to cosmos cspell dictionary

Nalu Tripician
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9bad803
bound materialized hedge region histories

Nalu Tripician
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42e63bd
Merge remote-tracking branch 'upstream/main' into nalutripician-cautious-waddle
Nalu Tripician
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472f8f5

Commits on Jul 29, 2026

Merge upstream/main into cosmos-hedge-obs

Nalu Tripician
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0c83f91

Commits on Jul 31, 2026

Merge upstream/main into cosmos-hedge-obs

Nalu Tripician
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59b0fab
Preserve hedge-loser diagnostics and true dispatch order

Nalu Tripician
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10249e5
Merge upstream/main into cosmos-hedge-obs

Nalu Tripician
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2cb3a00
Stop using deprecated ExecutionContext::Retry in tests
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04f4740

Commits on Aug 4, 2026

fix(cosmos): define SDK-owned RequestedRegion types

Nalu Tripician
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8504652
Remove ExecutionContext::Retry and collapse RequestedRegionReason into ExecutionContext

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8cd3811
Remove issue links from spec and CHANGELOG

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98a6cde
Resolve PR #4871 merge conflicts
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5ab7a3d
Resolve remaining PR #4871 merge conflicts
Nalu Tripician
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8ab150f
Drop workflow-file deltas from merge
Nalu Tripician
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d9dfadc
Build hedged counter in Instruments::new

Nalu Tripician
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0c29475
Use US spelling of finalization in region docs

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a2d4581
Merge main into Cosmos hedging work
Nalu Tripician
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120a9c0
Remove unrelated workflow changes
Nalu Tripician
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d1af5e3

Commits on Aug 6, 2026