enable outlier detection

[BenTheElder]

We should enable https://cloud.google.com/load-balancing/docs/https/setting-up-global-traffic-mgmt#configure_outlier_detection

https://github.com/kubernetes/k8s.io/tree/main/infra/gcp/terraform/modules/oci-proxy

I think last time I looked into this I got hung up on migrating to current terraform / modules versions in k8s.io and then got interrupted with other priorities, but it might be possible to do without updating those first.

xref: #274 (comment), previously #234

[upodroid]

Might not work as we are using Serverless NEGs that don't have health checks.

[BenTheElder]

Might not work as we are using Serverless NEGs that don't have health checks.

Outlier detection doesn't rely on (active) healthchecks, it's basically acting on observed response codes to normal requests.

It is available for serverless NEGs for a while now, with some limitations (I forget which but IIRC one of the config options wasn't applicable).

[BenTheElder]

It might not have solved this particular outage though, if nothing else since it's an LB behavior and LBs are impacted in some way (haven't had a chance to look further for now).

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/lifecycle stale

[BenTheElder]

/remove-lifecycle stale
/lifecycle frozen

We should still probably do this, it's just hard to prioritize versus getting the rest of the infra migrated into the community, we're rarely having outages as-is and it's not 100% clear if this would solve the problem(s) (needs more investigating, just haven't really had time and nobody else seems to have looked yet).