Alerting: Add recording rules to ruler API and validation (#87779)

* Read path, main API

* Define record field for incoming requests

* Refactor several alerting specific validators into two paths

* Refactor validateCondition actually contain all the condition validation logic

* Move condition validation inside rule path

* Validators for recording rules

* Wire feature flag through to validators

* Test for accepting a valid recording rule

* Tests for negative case, no UID

* Test for ignoring alerting fields

* Build conditions based on recording rules as well

* Regenerate swagger docs

* Fix CRUD test to cover the right thing

* Re-generate swagger docs with backdated v0.30.2 version

* Regenerate base spec

* Regenerate ngalert specs

* Regenerate top level specs

* Comment and rename

* Return struct instead of modifying ref

pkg/services/ngalert/api/tooling/definitions/cortex-ruler.go

@@ -487,6 +487,7 @@ type PostableGrafanaRule struct {
 	ExecErrState         ExecutionErrorState            `json:"exec_err_state" yaml:"exec_err_state"`
 	IsPaused             *bool                          `json:"is_paused" yaml:"is_paused"`
 	NotificationSettings *AlertRuleNotificationSettings `json:"notification_settings" yaml:"notification_settings"`
+	Record               *Record                        `json:"record" yaml:"record"`
 }
 
 // swagger:model
@@ -507,6 +508,7 @@ type GettableGrafanaRule struct {
 	Provenance           Provenance                     `json:"provenance,omitempty" yaml:"provenance,omitempty"`
 	IsPaused             bool                           `json:"is_paused" yaml:"is_paused"`
 	NotificationSettings *AlertRuleNotificationSettings `json:"notification_settings,omitempty" yaml:"notification_settings,omitempty"`
+	Record               *Record                        `json:"record,omitempty" yaml:"record,omitempty"`
 }
 
 // AlertQuery represents a single query associated with an alert definition.
@@ -576,6 +578,12 @@ func (d *Duration) UnmarshalYAML(unmarshal func(any) error) error {
 	}
 }
 
+// Record defines how data produced by a recording rule is written.
+type Record struct {
+	Metric string `json:"metric" yaml:"metric"`
+	From   string `json:"from" yaml:"from"`
+}
+
 // swagger:model
 type UpdateRuleGroupResponse struct {
 	Message string   `json:"message"`