Alerting: Add database migration for recording rule fields (#87012)

* Create recording rule fields in model

* Add migration

* Write to database, support in version table

* extend fingerprint

* Force fields to be empty on validate

* Another storage spot, tests for fingerprint

* Explicitly set defaults in provisioning API

* Tests for main API validation

* Add diff tests even though fields are unpopulated for now

* Use struct tag approach instead of FromDB/ToDB hooks as it better handles nulls when deserializing

* test for deser

* Backout RecordTo for now since it's not decided in the doc

* back out of migration too

* Drop datasourceref for now

* address linter complaints

* Try a single outer struct with all fields embedded

pkg/services/ngalert/schedule/registry.go

@@ -311,5 +311,10 @@ func (r ruleWithFolder) Fingerprint() fingerprint {
 	writeInt(int64(rule.RuleGroupIndex))
 	writeString(string(rule.NoDataState))
 	writeString(string(rule.ExecErrState))
+	if rule.Record != nil {
+		binary.LittleEndian.PutUint64(tmp, uint64(rule.Record.Fingerprint()))
+		writeBytes(tmp)
+	}
+
 	return fingerprint(sum.Sum64())
 }

pkg/services/ngalert/schedule/registry_test.go

@@ -192,6 +192,7 @@ func TestRuleWithFolderFingerprint(t *testing.T) {
 			RuleGroupIndex:  1,
 			NoDataState:     "test-nodata",
 			ExecErrState:    "test-err",
+			Record:          &models.Record{Metric: "my_metric", From: "A"},
 			For:             12,
 			Annotations: map[string]string{
 				"key-annotation": "value-annotation",
@@ -230,6 +231,7 @@ func TestRuleWithFolderFingerprint(t *testing.T) {
 			RuleGroupIndex:  22,
 			NoDataState:     "test-nodata2",
 			ExecErrState:    "test-err2",
+			Record:          &models.Record{Metric: "my_metric2", From: "B"},
 			For:             1141,
 			Annotations: map[string]string{
 				"key-annotation2": "value-annotation",