Previews: crawler as a background service (#44891)

* add SQL migrations

* dashboard previews from sql: poc

* added todos

* refactor: use the same enums where possible

* use useEffect, always return json

* added todo

* refactor + delete files after use

* refactor + fix manual thumbnail upload

* refactor: move all interactions with sqlStore to thumbnail repo

* refactor: remove file operations in thumb crawler/service

* refactor: fix dashboard_thumbs sql store

* refactor: extracted thumbnail fetching/updating to a hook

* refactor: store thumbnails in redux store

* refactor: store thumbnails in redux store

* refactor: private'd repo methods

* removed redux storage, saving images as blobs

* allow for configurable rendering timeouts

* added 1) query for dashboards with stale thumbnails, 2) command for marking thumbnails as stale

* use sql-based queue in crawler

* ui for marking thumbnails as stale

* replaced `stale` boolean prop with `state` enum

* introduce rendering session

* compilation errors

* fix crawler stop button

* rename thumbnail state frozen to locked

* #44449: fix merge conflicts

* #44449: remove thumb methods from `Store` interface

* #44449: clean filepath, defer file closing

* #44449: fix rendering.Theme cyclic import

* #44449: linting

* #44449: linting

* #44449: mutex'd crawlerStatus access

* #44449: added integration tests for `sqlstore.dashboard_thumbs`

* #44449: added comments to explain the `ThumbnailState` enum

* #44449: use os.ReadFile rather then os.Open

* #44449: always enable dashboardPreviews feature during integration tests

* #44449: remove sleep time, adjust number of threads

* #44449: review fix: add `orgId` to `DashboardThumbnailMeta`

* #44449: review fix: automatic parsing of thumbnailState

* #44449: lint fixes

* #44449: crawler as a background service v0.1

* #44449: use ServerLockService

* #44449: use ServerLockService

* #44449: review fix: prefer `WithDbSession` over `WithTransactionalDbSession`

* #44449: review fix: add a comment explaining source of the filepath

* #44449: review fix: added filepath validation

* #44449: fix FindDashboardsWithStaleThumbnails to include `theme` and `kind` in search params

* #44449: fix FindDashboardsWithStaleThumbnails to include `theme` and `kind` in search params

* #44449: create function for crawler on demand

* #44449: improve crawler logging

* #44449: fix wire

* #44449: uncomment dummy thumb service, fix ticker interval

* #44449: prevent race condition

* #44449: improve logging

* #44449: fix theme

* #44449: review fixes https://github.com/grafana/grafana/pull/45063/files @fzambia

* #44449: add missing unlock

* #44449: merge

* #44449: review fix - logger @fzambia https://github.com/grafana/grafana/pull/45063/files

* #44449: formatting

* #44449: merge conflict fix

* #44449: merge conflict fix

* #44449: merge conflict fix

* #44449: naming fix

* #44449: update authOpts

* #44449: change authOpts.role back to admin

* #44449: fix `walk` signature, move ctx to a first argument

* #44449: add `dashboardPreviewsScheduler` feature flag

Co-authored-by: Ryan McKinley <ryantxu@gmail.com>
Co-authored-by: Alexander Emelin <frvzmb@gmail.com>

packages/grafana-data/src/types/featureToggles.gen.ts

@@ -22,6 +22,7 @@ export interface FeatureToggles {
   ['service-accounts']?: boolean;
   database_metrics?: boolean;
   dashboardPreviews?: boolean;
+  dashboardPreviewsScheduler?: boolean;
   ['live-config']?: boolean;
   ['live-pipeline']?: boolean;
   ['live-service-web-worker']?: boolean;