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## 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.
Pulse documentation
Start here for installation, platform setup, security, operations, and Pulse Intelligence. Commands, configuration keys, image names, API fields, and product identifiers remain untranslated in localized guides.
Start here
- Install Pulse — signed Proxmox/Linux installation, Docker, Docker Compose, Kubernetes, and first-run setup.
- Production deployment and security — least-privilege Proxmox setup, root-agent boundaries, discovery, supply-chain verification, plan limits, scale evidence, and a rollout checklist.
- Upgrade from Pulse v5 — migration prerequisites, rollback, agent continuity, and post-upgrade checks.
- Releases and update channels: choosing Stable or Preview, beta and RC expectations, and how releases are tested and promoted.
- Configure Pulse — authentication, notifications, discovery, retention, and system settings.
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Localized getting started guides: Deutsch · Español
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VMware vSphere support is early access. Current builds expose dedicated vSphere inventory and recovery context, but operators should validate the integration against their own vCenter before production use.
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Patrol watch-only analysis is available on Community with a local model or the operator's own provider. Investigation and governed fixes require the relevant Pulse Pro capabilities.
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Pulse Cloud is not generally available. Ordinary self-hosted Pulse remains the primary installation path; MSP and Enterprise access are explicit commercial paths rather than defaults in self-hosted setup.
Development and reference
Detailed design notes and dated migration specifications may remain in this directory for maintainers, but they are not operator setup guides unless they are linked from the sections above.
Previous versions and migrations
- Upgrade from v4 to v5
- Retired unified-navigation migration — historical context only; current Pulse uses platform-shaped navigation.
- Move a Pulse installation
Found a bug? Use the issue forms. For setup questions, use GitHub Discussions.