feat(metrics): migrate sei-cosmos module packages to OpenTelemetry (PLT-414)

[amir-deris]

Summary

Migrates the following sei-cosmos packages from legacy telemetry/go-metrics to OpenTelemetry, using the dual-emit pattern (OTel instrument recorded first, old call retained with TODO(PLT-414) for removal once verified):

• types/module — module_total_mid_block_duration, module_mid_block_duration (per-module label)
• x/evidence — begin_blocker_duration
• x/capability — begin_blocker_duration
• x/crisis — end_blocker_duration, init_genesis_unmarshal_duration
• x/distribution — begin_blocker_duration
• x/gov — end_blocker_duration
• x/slashing — begin_blocker_duration; keeper: validator_slashed (with type + validator attributes)
• x/staking — begin_blocker_duration, end_blocker_duration

Each package gets a new metrics.go defining its OTel meter and instruments, following the pattern established in x/upgrade (PLT-353).

[cursor]

PR Summary

Low Risk
Observability-only changes with no consensus or state-machine logic altered; legacy metrics remain until verification.

Overview
This PR extends the PLT-414 OpenTelemetry migration across sei-cosmos module packages, using the same dual-emit pattern as x/upgrade (PLT-353): record OTel first, keep legacy telemetry calls behind TODO(PLT-414) until dashboards are validated.

New metrics.go files define package-scoped OTel meters and instruments—mostly second-based histograms with shared fine-grained bucket boundaries—for begin/end blocker timing in capability, crisis, distribution, evidence, gov, slashing, and staking, plus crisis InitGenesis unmarshal duration. types/module adds module_total_mid_block_duration and per-module module_mid_block_duration, with module attributes precomputed in SetOrderMidBlockers to avoid per-block allocations in MidBlock.

Slashing keeper adds an OTel validator_slashed counter (with type and validator labels) on double-sign and downtime slash paths. Staking keeper renames existing OTel instrument names to a staking_keeper_* prefix for clearer namespacing.

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[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	May 29, 2026, 5:56 PM

[codecov]

Codecov Report

❌ Patch coverage is 79.77528% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.17%. Comparing base (c4e1a2a) to head (1e237ac).

Files with missing lines	Patch %	Lines
sei-cosmos/types/module/metrics.go	50.00%	1 Missing and 1 partial ⚠️
sei-cosmos/x/capability/metrics.go	50.00%	1 Missing and 1 partial ⚠️
sei-cosmos/x/crisis/metrics.go	50.00%	1 Missing and 1 partial ⚠️
sei-cosmos/x/distribution/metrics.go	50.00%	1 Missing and 1 partial ⚠️
sei-cosmos/x/evidence/metrics.go	50.00%	1 Missing and 1 partial ⚠️
sei-cosmos/x/gov/metrics.go	50.00%	1 Missing and 1 partial ⚠️
sei-cosmos/x/slashing/keeper/metrics.go	50.00%	1 Missing and 1 partial ⚠️
sei-cosmos/x/slashing/metrics.go	50.00%	1 Missing and 1 partial ⚠️
sei-cosmos/x/staking/metrics.go	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3512      +/-   ##
==========================================
- Coverage   59.05%   58.17%   -0.89%     
==========================================
  Files        2205     2138      -67     
  Lines      182317   173502    -8815     
==========================================
- Hits       107672   100939    -6733     
+ Misses      64945    63587    -1358     
+ Partials     9700     8976     -724     

Flag	Coverage Δ
sei-chain-pr	73.46% <79.77%> (?)
sei-db	70.41% <ø> (-0.22%)	⬇️
sei-db-state-db	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-cosmos/types/module/module.go	60.33% <100.00%> (+1.56%)	⬆️
sei-cosmos/x/capability/abci.go	100.00% <100.00%> (ø)
sei-cosmos/x/crisis/abci.go	100.00% <100.00%> (ø)
sei-cosmos/x/crisis/module.go	68.85% <100.00%> (+0.51%)	⬆️
sei-cosmos/x/distribution/abci.go	100.00% <100.00%> (ø)
sei-cosmos/x/evidence/abci.go	46.15% <100.00%> (+23.93%)	⬆️
sei-cosmos/x/gov/abci.go	94.93% <100.00%> (+0.27%)	⬆️
sei-cosmos/x/slashing/abci.go	93.75% <100.00%> (+0.89%)	⬆️
sei-cosmos/x/slashing/keeper/infractions.go	96.39% <100.00%> (+0.03%)	⬆️
sei-cosmos/x/slashing/keeper/keeper.go	85.41% <100.00%> (+0.31%)	⬆️
... and 11 more

... and 112 files with indirect coverage changes

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[bdchatham]

Two focused follow-ups from a cross-review pass. (Both non-blocking on their own — the larger naming-collision discussion on the per-package begin_blocker_duration / end_blocker_duration instruments is separate.)

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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