consensus: calculate prevote message delay metric (backport #7551)#7618
Merged
williambanfield merged 2 commits intov0.35.xfrom Jan 19, 2022
Merged
consensus: calculate prevote message delay metric (backport #7551)#7618williambanfield merged 2 commits intov0.35.xfrom
williambanfield merged 2 commits intov0.35.xfrom
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## What does this pull request do?
This pull requests adds two metrics intended for use in calculating an experimental value for `MessageDelay`.
The metrics are as follows:
```
# HELP tendermint_consensus_complete_prevote_message_delay Difference in seconds between the proposal timestamp and the timestamp of the prevote that achieved 100% of the voting power in the prevote step.
# TYPE tendermint_consensus_complete_prevote_message_delay gauge
tendermint_consensus_complete_prevote_message_delay{chain_id="test-chain-aZbwF1"} 0.013025505
# HELP tendermint_consensus_quorum_prevote_message_delay Difference in seconds between the proposal timestamp and the timestamp of the prevote that achieved a quorum in the prevote step.
# TYPE tendermint_consensus_quorum_prevote_message_delay gauge
tendermint_consensus_quorum_prevote_message_delay{chain_id="test-chain-aZbwF1"} 0.013025505
```
## Why this change?
For more information on what these metrics are calculating, see #7202. The aim is to merge to backport these metrics to v0.34 and run nodes on a few popular chains with these metrics to determine the experimental values for `MessageDelay` on these popular chains and use these to select our default `SynchronyParams.MessageDelay` value.
## Why Gauges for the metrics?
Gauges allow us to overwrite the metric on each successive observation. We can then capture these metrics over time to track the highest and lowest observed value.
(cherry picked from commit 0c82cea)
# Conflicts:
# internal/consensus/state.go
williambanfield
approved these changes
Jan 19, 2022
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This is an automatic backport of pull request #7551 done by Mergify.
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