## What this PR does
The tenant etcd chart has its own copy of
`etcdHighNumberOfFailedGRPCRequests`, and both of its rules count every
`grpc_code` other than `OK` as a failure. `grpc_server_handled_total`
counts a Watch stream once, when it ends, and the streams of a
kube-apiserver that goes away end with `Canceled`. So whenever an API
server on a tenant etcd stops, the Watch method of every member reads as
100 percent failed and the critical rule fires on all of them.
Both rules now count only
`Unknown|FailedPrecondition|ResourceExhausted|Internal|Unavailable|DataLoss|DeadlineExceeded`,
the list the etcd mixin has used since etcd-io/etcd#13127 and the one
the platform copy in
`packages/system/monitoring-agents/alerts/etcd.yaml` already uses. The
grouping `BY (job, instance, grpc_service, grpc_method)`, the
thresholds, `for` and the annotations stay as they are, so the alerts
keep their labels.
Seen on a v1.6.5 cluster while a Kubernetes cluster on a tenant etcd was
created and deleted a few minutes later. vmalert had the critical alert
firing for `grpc_method="Watch"` on all three members with the value
100. At that point
`rate(grpc_server_handled_total{grpc_code!="OK"}[10m])` was 0.63 for
Watch with `Canceled`, and the only other non-OK codes were
`FailedPrecondition` on `RoleGet` and `UserGet` at 0.0017 each, which is
one call each. The same query an hour earlier returned nothing. The
platform copy runs in the same vmalert over the same series, and none of
the firing alerts came from it. Each alert also showed up seven times
there, once per tenant copy of these rules, because the root tenant's
vmalert loads the rules of every tenant namespace. This PR does not
change that.
`hack/etcd-grpc-alerts.bats` renders the chart's PrometheusRule with
`helm template` and replays it through `vmalert-tool` v1.136.0 pinned by
digest, the same image #4963 uses.
`hack/testdata/etcd-grpc-alerts/unittest.yaml` has three cases with
seven checks. Watch streams that end only with `Canceled` must not fire
at 6, 12 and 30 minutes. `Range` calls failing with `Unavailable` at 25
percent must fire the critical rule at 7 minutes and both rules at 12,
with the labels and the summary pinned. Both together must fire only for
`Range`. Against the rules on main the suite fails 4 of the 7 checks,
all of them on Watch alerts with the value 100. Dropping `Unavailable`
from the list, or grouping by `job` and `instance` only, fails 3 checks
each.
```console
$ bats hack/etcd-grpc-alerts.bats
1..1
ok 1 tenant etcd failed gRPC request alerts pass their vmalert-tool cases
```
The same run on the rules from main prints `not ok 1` and the four
failing checks. With Bats 1.14.0 at the commit CI pins, the suite passes
together with `bats-strict-setup`, `bats-no-negated-assert`,
`bats-no-exit-trap`, `bats-runner-coverage`, `bats-runner-contract`,
`alert-severity-contract` and `image-pin-consistency`, 81 of 81. Like
the migration suites it needs docker, and only the image pull touches
the network. Helm 3.17.3 and 4.2.4 render the same rules. I have not run
the new rules in vmalert on a live cluster.
The rules file is the same on release-1.6 and release-1.7. The commit
cherry-picks onto release-1.6 without conflicts, and that backport is a
separate PR with one more commit that drops the `load test_helper` line,
because release-1.6 runs `hack/*.bats` through `hack/cozytest.sh`.
### Screenshots
Not a UI change.
### Downstream repositories
A rule template in `packages/extra/etcd`, a Bats suite under `hack/` and
its test data. No values, schema, README, image or
`ApplicationDefinition` change, and the website does not mention these
rules, so no trigger map entry applies.
- [x] No downstream repository is affected by this change
- [ ] [cozystack/website](https://github.com/cozystack/website) -
follow-up:
- [ ]
[cozystack/terraform-provider-cozystack](https://github.com/cozystack/terraform-provider-cozystack)
- follow-up:
- [ ]
[cozystack/ansible-cozystack](https://github.com/cozystack/ansible-cozystack)
- follow-up:
- [ ] [cozystack/ccp](https://github.com/cozystack/ccp) - follow-up:
- [ ] [cozystack/talm](https://github.com/cozystack/talm) - follow-up:
- [ ] [cozystack/cozyhr](https://github.com/cozystack/cozyhr) -
follow-up:
- [ ] [cozystack/cozy-proxy](https://github.com/cozystack/cozy-proxy) -
follow-up:
- [ ]
[cozystack/cozystack-telemetry-server](https://github.com/cozystack/cozystack-telemetry-server)
- follow-up:
- [ ]
[cozystack/external-apps-example](https://github.com/cozystack/external-apps-example)
- follow-up:
- [ ] [cozystack/examples](https://github.com/cozystack/examples) -
follow-up:
- [ ] [cozystack/community](https://github.com/cozystack/community) -
follow-up:
### Release note
```release-note
fix(etcd): the tenant etcd alert etcdHighNumberOfFailedGRPCRequests now counts only the gRPC codes that the etcd mixin and the platform copy of the alert count, so the Canceled watch streams of a Kubernetes API server that stops no longer fire it on every etcd member.
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Bug Fixes**
- Refined etcd gRPC failure alerts to target specific failure status
codes, reducing alerts for non-failure responses while preserving
existing thresholds and timing.
- Added coverage for canceled watch streams, unavailable range requests,
and combined failure scenarios, including warning and critical alert
evaluations.
- **Tests**
- Added integration validation for rendering etcd alert rules and
running them through the alert-testing tool, including failure handling
when prerequisites are unavailable.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
myasnikovdaniil
432d02e20c