Perf: add an software override (1.5sec) for `TimeoutPropose` (backport #1751)

[mergify[bot]]

Problem

Network experiences a ~5sec block time when a proposer is offline/severely lagging behind. This is due to the current software default, TimeoutPropose = 3s, which means that when a proposer is unavailable, we spend 3s waiting for the proposal + 0.5s for round 0 prevote/precommit, so ~3.5s more than an average block.

This software default of 3s was not conscious, and could've been updated along when timeout_commit was reduced to 500ms.

See attached block dump during a period when 2 small validators went offline, and 4% of the blocks have elevated >5sec blocks. As a result, average block time is much higher than median block time during this period:

Median block time: 1.1144995 seconds Average block time: 1.35415654 seconds

Solution

Add a software override for TimeoutPropose to 1.5s. This should be way more than enough for a block where proposer is present. More aggressive value (e.g. 1s) is also possible and can be done in future upgrades.

This should reduce p98 (by ~30%) as well as average block time.

Requires a coordinated upgrade to maintain synchrony among validators (technically, not state-breaking but consensus-breaking)

Author/Reviewer Checklist

• [ ] If this PR has changes that result in a different app state given the same prior state and transaction list, manually add the state-breaking label.
• [ ] If the PR has breaking postgres changes to the indexer add the indexer-postgres-breaking label.
• [ ] If this PR isn't state-breaking but has changes that modify behavior in PrepareProposal or ProcessProposal, manually add the label proposal-breaking.
• [ ] If this PR is one of many that implement a specific feature, manually label them all feature:[feature-name].
• [ ] If you wish to for mergify-bot to automatically create a PR to backport your change to a release branch, manually add the label backport/[branch-name].
• [ ] Manually add any of the following labels: refactor, chore, bug.

Summary by CodeRabbit

• New Features
  • Introduced an option to override the timeout_propose consensus parameter, enhancing control over proposal timeouts.

---

This is an automatic backport of pull request #1751 done by Mergify.

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