[KaloyanTanev]

From the gloas fork, proposer duties use 1.5s rounds anchored at the duty start with double_round_on_rearm_min_1s, so proposal_timeout no longer applies to them. The alpha linear feature proposes a quicker rotating shape instead (1.5s, 600ms, 900ms, 1.2s, ...), which the cluster agrees on through the priority protocol as the new proposer_timer infosync topic, encoded as the timer and the inputs of its timer function (linear/1.5s/300ms, eager_dlinear/1.5s): every peer uses the agreed timer from the next slot once at least a threshold of peers propose it, and the default until then. Since consensus accepts a leader's proposed value as is, peers now verify every decided priority result against its signed proposals before acting on it. Pre-gloas timers and the behaviour of linear before the fork are unchanged.

category: feature
ticket: #4324
feature_flag: linear

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.86%. Comparing base (2b534eb) to head (115a740).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
core/infosync/infosync.go	73.17%	11 Missing ⚠️
app/app.go	0.00%	2 Missing ⚠️
core/priority/prioritiser.go	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4818      +/-   ##
==========================================
+ Coverage   67.67%   67.86%   +0.19%     
==========================================
  Files         255      255              
  Lines       33668    33781     +113     
==========================================
+ Hits        22784    22926     +142     
+ Misses      10883    10854      -29     
  Partials        1        1              

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[Copilot]

🟡 Changes recommended

Critical info-sync flaws allow cross-slot timer disagreement and adoption of unsupported leader-supplied timers, risking misaligned round deadlines and stalled proposer duties.

2 open issues

• Info-sync results can change proposer timers across slot boundaries · New
• Info-sync adopts unauthenticated timer topics without threshold validation · New

What changed in this PR

Adds Gloas-specific proposer timers to Charon’s consensus workflow, supporting the hardfork preparation in #4324 while preserving pre-Gloas behavior.

Changes:

• Introduces duty-start-anchored proposer timers with 1.5s default rounds and a faster linear alternative.
• Negotiates timer types and inputs through the proposer_timer info-sync topic.
• Updates consensus metrics, tests, and documentation for the new timing behavior.

File	Description
testutil/​integration/​infosync_test.go	Expects the proposer timer topic in integration results.
docs/​structure.md	Updates the InfoSync package description.
docs/​consensus.md	Documents Gloas timers, negotiation, and extensions.
docs/​architecture.md	Adds proposer timers to InfoSync’s documented responsibilities.
core/​infosync/​infosync.go	Advertises, stores, and retrieves agreed proposer timers.
core/​infosync/​infosync_internal_test.go	Tests timer proposals, results, and activation slots.
core/​consensus/​timer/​timers.go	Parameterizes timer definitions and adds Gloas durations.
core/​consensus/​timer/​roundtimer.go	Selects Gloas proposer timers and parses agreed inputs.
core/​consensus/​timer/​roundtimer_test.go	Tests fork-aware timer selection and registration inputs.
core/​consensus/​timer/​roundtimer_internal_test.go	Tests timer schedules, extensions, and input parsing.
core/​consensus/​qbft/​roundtimer_internal_test.go	Adapts timer construction to the agreement callback.
core/​consensus/​qbft/​qbft.go	Connects timer agreement to QBFT and records the selected timer.
core/​consensus/​qbft/​qbft_internal_test.go	Tests proposer timer callback registration.
core/​consensus/​instance/​instance_io.go	Stores the instance’s timer type for metrics.
app/​featureset/​featureset.go	Clarifies feature comments for Gloas behavior.
app/​app.go	Wires InfoSync timer agreement into consensus.

_{Review effort: Balanced}

[Copilot]

🔵 Needs a closer look

Coupled changes to QBFT leader-rotation deadlines and cluster-wide timer negotiation require human assessment and multi-node fault-injection validation of proposer liveness under leader failure across mixed-feature, mixed-version, and restarted peers.

No open issues 🎉

2 resolved since last review

• Info-sync adopts unauthenticated timer topics without threshold validation
• Info-sync results can change proposer timers across slot boundaries

_{Review effort: Balanced}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud