gossip: remove gossip eventlog

[petermattis]

Remove the gossip eventlog which was the last remaining use of AmbientContext.{Set,Finish}EventLog allowing those methods to be removed as well. Remove log.With{,No}EventLog which were not being used and remove the associated eventlog machinery from util/log.

Epic: none
Release note (general change): Remove the /debug/events endpoint which is no longer populated.

[cockroach-teamcity]

This change is 

[petermattis]

Release note (general change): Remove the /debug/events endpoint which is no longer populated.

This is true after #117928 merges.

[RaduBerinde]

Reviewable status: complete! 1 of 0 LGTMs obtained (waiting on @erikgrinaker, @jbowens, @nvanbenschoten, @petermattis, and @xinhaoz)

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pkg/util/log/trace.go line 43 at r1 (raw file):

// remain in the result.
func eventInternal(sp *tracing.Span, isErr bool, entry *logEntry) {
	if sp != nil {

I don't think we need this check anymore.

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pkg/util/log/trace.go line 186 at r1 (raw file):

var _ = VErrEventfDepth // silence unused warning

// HasSpan returns true if the context has a span or event that should

remote "or event"

[petermattis]

TFTR!

Reviewable status: complete! 0 of 0 LGTMs obtained (and 1 stale) (waiting on @erikgrinaker, @jbowens, @nvanbenschoten, @RaduBerinde, and @xinhaoz)

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pkg/util/log/trace.go line 43 at r1 (raw file):

Previously, RaduBerinde wrote…

I don't think we need this check anymore.

Good point. Removed.

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pkg/util/log/trace.go line 186 at r1 (raw file):

Previously, RaduBerinde wrote…

remote "or event"

Ack. I caught a number of other instances of "event log" that have been removed as well.

[petermattis]

bors r+

[craig]

This PR was included in a batch that timed out, it will be automatically retried

[craig]

This PR was included in a batch that timed out, it will be automatically retried

[craig]

Build succeeded:

• Bazel Essential CI (Cockroach)