Adds a feature flag (alertingUpgradeDryrunOnStart) that will dry-run the legacy
alert upgrade on startup. It is enabled by default.
When on legacy alerting, this feature flag will log the results of the legacy
alerting upgrade on startup and draw attention to anything in the current legacy
alerting configuration that will cause issues when the upgrade is eventually
performed. It acts as a log warning for those where action is required before
upgrading to Grafana v11 where legacy alerting will be removed.
* Alerting: During legacy migration reduce the number of created silences
During legacy migration every migrated rule was given a label rule_uid=<uid>.
This was used to silence DatasourceError/DatasourceNoData alerts for
migrated rules that had either ExecutionErrorState/NoDataState set to
keep_state, respectively.
This could potentially create a large amount of silences and a high cardinality
label. Both of these scenarios have poor outcomes for CPU load and latency in
unified alerting.
Instead, this change creates one label per ExecutionErrorState/NoDataState when
they are set to keep_state as well as two silence rules, if rules with said
labels were created during migration. These silence rules are:
- __legacy_silence_error_keep_state__ = true
- __legacy_silence_nodata_keep_state__ = true
This will drastically reduce the number of created silence rules in most cases
as well as not create the potentially high cardinality label `rule_uid`.
This PR has two steps that together create a functional dry-run capability for the migration.
By enabling the feature flag alertingPreviewUpgrade when on legacy alerting it will:
a. Allow all Grafana Alerting background services except for the scheduler to start (multiorg alertmanager, state manager, routes, …).
b. Allow the UI to show Grafana Alerting pages alongside legacy ones (with appropriate in-app warnings that UA is not actually running).
c. Show a new “Alerting Upgrade” page and register associated /api/v1/upgrade endpoints that will allow the user to upgrade their organization live without restart and present a summary of the upgrade in a table.
* Alerting: Move migration from background service run to ngalert init
sqlite database write contention between the migration's single transaction and
dashboard provisioning's frequent commits was causing the migration to
fail with SQLITE_BUSY/SQLITE_BUSY_SNAPSHOT on all retries.
This is not a new issue for sqlite+grafana, but the discrepancy between the
length of the transactions was causing it to be very consistent. In addition,
since a failed migration has implications on the assumed correctness of the
alertmanager and alert rule definition state, we cause a server shutdown on
error. This can make e2e tests as well as some high-load provisioned
sqlite installations flaky on startup.
The correct fix for this is better transaction management across various
services and is out of scope for this change as we're primarily interested in
mitigating the current bout of server failures in e2e tests when using sqlite.
This PR replaces the vendored models in the migration with their equivalent ngalert models. It also replaces the raw SQL selects and inserts with service calls.
It also fills in some gaps in the testing suite around:
- Migration of alert rules: verifying that the actual data model (queries, conditions) are correct 9a7cfa9
- Secure settings migration: verifying that secure fields remain encrypted for all available notifiers and certain fields migrate from plain text to encrypted secure settings correctly e7d3993
Replacing the checks for custom dashboard ACLs will be replaced in a separate targeted PR as it will be complex enough alone.
