Finalized and Safe Height Metrics are Zero (0) on Prometheus Endpoint

[ncavedale-xlabs]

Hi team!
Metrics chain_head_finalized and chain_head_safe return "0" for Bor:

# TYPE chain_head_finalized gauge
chain_head_finalized 0

# TYPE chain_head_safe gauge
chain_head_safe 0

Is this by design? Are there plans to implement/fix these?

Thanks!

[marcello33]

Hey @ncavedale-xlabs, what version of bor are you using?

[github-actions]

This issue is stale because it has been open 14 days with no activity. Remove stale label or comment or this will be closed in 14 days.

[MqllR]

After looking at the bor codebase, it seems like the finality isn't handled exactly the same way as geth. When you run a eth_getBlockByNumber with the finalize tag, you reach some bor specific code that uses the milestones https://github.com/maticnetwork/bor/blob/master/eth/api.go#L56.
The metric chain_milestone_latest seems to be pretty close to the block number retrieved with a eth_getBlockByNumber call. But I let the Polygon experts confirm or not :)

[avalkov]

Yes, finality is not handled the same way. To get final block you must get latest milestone or checkpoint.