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rcourtman
23bf99e1ba
## Problem
Saving anything on Alerts > Thresholds turned flapping detection and
alert TTL cleanup off. The page's `PUT /api/alerts/config` body never
carries `flappingEnabled`, `maxAlertAgeDays`, `maxAcknowledgedAgeDays`,
`autoAcknowledgeAfterHours` or `customRules` (the page has no control
for any of them). `UpdateAlertConfig` decoded the body into a zero
`AlertConfig`, so every save wrote `false`/`0` for those fields, reset
the flapping tuning to defaults, dropped custom rules, and persisted
that. The `flapping`, `aggregation` and `ioNormalization` objects the
page sends are not `AlertConfig` fields and never enabled anything.
## Fix
- `PUT /api/alerts/config` now replaces only the top-level keys the body
carries. A key left out keeps its stored value. A sent key replaces its
setting whole, so `"overrides": {}` still clears overrides, and the
usual normalization still runs. A body that is not a JSON object
(including `null`) is a 400 and changes nothing.
- `alertconfig.ApplyAlertConfigUpdate` decodes the body on its own, so
sent keys get exact `encoding/json` semantics, including duplicates and
case-folded keys. It copies every unsent top-level field from a JSON
clone of the stored config.
- `Manager.ApplyConfigUpdate` reads, merges and applies under the
manager lock, so concurrent partial saves cannot revert each other. It
returns an owned snapshot, which the handler persists, so
`SaveAlertConfig`'s in-place normalization no longer writes into the
live config's maps. The handler runs one save at a time, so successful
saves reach `alerts.json` in the order they were applied.
- Stored configs are not rewritten; a value an earlier save zeroed stays
as it is.
## Verification
- Unit: `internal/alerts/config/update_test.go`; manager save path and
concurrent partial updates in
`internal/alerts/config_validation_test.go`; handler against a real
manager in `internal/api/alerting/alerts_test.go`. Each new regression
fails against main's code (overlay negative controls). The concurrency
test fails at round 0 against a non-atomic variant.
- `go test ./internal/alerts/... ./internal/api/alerting/` and the
`internal/api` alert endpoint, tenant and scope tests pass; the alert
tests pass under `-race`.
- Private stack (mock mode, Vite on main's frontend):
- On main, a node CPU change saved from the Thresholds page took
flapping and all three TTLs to false/0, in memory and in `alerts.json`.
- With this change, the same UI save kept them (true/7/1/24) and stored
the new threshold.
- The API repro (GET, drop the four keys, PUT) keeps them; explicit
`false`/`0` still applies; `null` and `[]` return 400.
- Five rounds of concurrent partial PUTs kept both changes in memory and
on disk.
## Follow-ups
- The thresholds page still sends the dead
`flapping`/`aggregation`/`ioNormalization` objects and hard-coded
`minimumDelta`/`suppressionWindow`/`hysteresisMargin`. A frontend
cleanup will follow once the open PRs touching
`alertsConfigurationModel.ts` land.
- `SaveAlertConfig` still normalizes caller-owned maps in place for
other callers (`ActivateAlerts`, startup paths), and the GET handler
encodes a shallow copy. That pre-existing race is tracked separately.