Add value for MaxBuilderEpochMissedSlots

[bnovil]

What type of PR is this?

Bug fix

What does this PR do? Why is it needed?
Add value for MaxBuilderEpochMissedSlots to make it consistent with the documentation, https://docs.prylabs.network/docs/advanced/builder

Circuit breaker
The circuit breaker is a safety feature for falling back to local execution when using a builder. This occurs when the builder or client using the builder endpoints encounters issues that cause missed blocks. By default, the circuit breaker will be triggered after 3 slots are consecutively missed or 5 slots are missed in an epoch, but this can be configured through the --max-builder-consecutive-missed-slots and max-builder-epoch-missed-slots flags.

Which issues(s) does this PR fix?

Fixes #14275

Other notes for review

[prestonvanloon]

@terencechain please review this. Why is there no default flag value and is it safe to add one?

edit: introduced in #11215

[prestonvanloon]

@rkapka Please review also. Looks like the default value was removed in #13186?

[potuz]

@terencechain please review this. Why is there no default flag value and is it safe to add one?

edit: introduced in #11215

I thought this was covered here
https://github.com/prysmaticlabs/prysm/blob/develop/config/params/mainnet_config.go#L265

It needs different values per chain, I'd close this one @prestonvanloon

[prestonvanloon]

Thanks @potuz.

We can either close this entirely or merge with a comment mentioning that the defaults are on a network basis and we can provide the default value for mainnet in the description such that users can understand from the help text.

@bnovil What do you think?

[bnovil]

Thanks @potuz.

We can either close this entirely or merge with a comment mentioning that the defaults are on a network basis and we can provide the default value for mainnet in the description such that users can understand from the help text.

@bnovil What do you think?

I see. I'd like to update the description to make it easier to understand. Thanks for your explanation.