Adding a metric for hosts not being found in resolver #5414
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davidporter-id-au
changed the title
dkrotx
reviewed
Oct 8, 2023
common/membership/resolver.go
Outdated
| @@ -193,6 +198,7 @@ func (rpo *MultiringResolver) Unsubscribe(service string, name string) error { | |||
| func (rpo *MultiringResolver) Members(service string) ([]HostInfo, error) { | |||
| ring, err := rpo.getRing(service) | |||
| if err != nil { | |||
| rpo.metrics.Scope(metrics.ResolverHostNotFoundScope).IncCounter(1) | |||
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Isn't it better to move to LookupByAddress() which calls Members?
Then it would be clear - every time LookupByAddress returns empty HostInfo we emit the metric.
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yes, you're right, I was being a bit hurried and this doesn't make sense
dkrotx
approved these changes
Oct 8, 2023
3vilhamster
reviewed
Oct 10, 2023
common/membership/resolver.go
Outdated
| @@ -26,6 +26,7 @@ package membership | |||
| import ( | |||
| "errors" | |||
| "fmt" | |||
| "github.com/uber/cadence/common/metrics" | |||
common/membership/resolver_test.go
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| @@ -23,6 +23,7 @@ | |||
| package membership | |||
|
|
|||
| import ( | |||
| "github.com/uber/cadence/common/metrics" | |||
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What changed?
Adds a metric around hosts not being visible in the resolver. This is for debugging and early alerting, though it's normal for this metric to appear during rebalancing or deployments temporarily. Long periods of this metric firing may indicate a problem with service discovery.
Why?
How did you test it?
Potential risks
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Documentation Changes