Alerting: Remove mute timings from alert rules on deletion (#1724)

Closes #1713
This was broken in Grafana Cloud when grafana/grafana#90500 was released

internal/resources/grafana/resource_alerting_mute_timing.go

@@ -252,6 +252,34 @@ func deleteMuteTiming(ctx context.Context, data *schema.ResourceData, meta inter
 		}
 	}
 
+	// Remove the mute timing from alert rules
+	ruleResp, err := client.Provisioning.GetAlertRules()
+	if err != nil {
+		return diag.FromErr(err)
+	}
+	rules := ruleResp.Payload
+	for _, rule := range rules {
+		if rule.NotificationSettings == nil {
+			continue
+		}
+
+		var muteTimeIntervals []string
+		for _, m := range rule.NotificationSettings.MuteTimeIntervals {
+			if m != name {
+				muteTimeIntervals = append(muteTimeIntervals, m)
+			}
+		}
+		if len(muteTimeIntervals) != len(rule.NotificationSettings.MuteTimeIntervals) {
+			rule.NotificationSettings.MuteTimeIntervals = muteTimeIntervals
+			params := provisioning.NewPutAlertRuleParams().WithBody(rule).WithUID(rule.UID)
+			_, err = client.Provisioning.PutAlertRule(params)
+			if err != nil {
+				return diag.FromErr(err)
+			}
+		}
+	}
+
+	// Delete the mute timing
 	params := provisioning.NewDeleteMuteTimingParams().WithName(name)
 	_, err = client.Provisioning.DeleteMuteTiming(params)
 	diag, _ := common.CheckReadError("mute timing", data, err)

internal/resources/grafana/resource_alerting_mute_timing_test.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	"github.com/grafana/grafana-openapi-client-go/models"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/acctest"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
 
 	"github.com/grafana/terraform-provider-grafana/v3/internal/testutils"
@@ -143,7 +144,7 @@ func TestAccMuteTiming_RemoveInUse(t *testing.T) {
 				contact_point = grafana_contact_point.default_policy.name
 			}
 		}
-		
+
 		resource "grafana_mute_timing" "test" {
 			count = local.use_mute ? 1 : 0
 			org_id = grafana_organization.my_org.id
@@ -164,3 +165,77 @@ func TestAccMuteTiming_RemoveInUse(t *testing.T) {
 		},
 	})
 }
+
+func TestAccMuteTiming_RemoveInUseInAlertRule(t *testing.T) {
+	testutils.CheckCloudInstanceTestsEnabled(t) // TODO: Switch to OSS when this is released: https://github.com/grafana/grafana/pull/90500
+
+	randomStr := acctest.RandString(6)
+
+	config := func(mute bool) string {
+		return fmt.Sprintf(`
+		locals {
+			use_mute = %[2]t
+		}
+		
+		resource "grafana_folder" "rule_folder" {
+			title  = "%[1]s"
+		}
+		
+		resource "grafana_contact_point" "default_policy" {
+			name   = "%[1]s"
+			email {
+				addresses = ["[email protected]"]
+			}
+		}
+
+		resource "grafana_rule_group" "this" {
+			name               = "%[1]s"
+			folder_uid         = grafana_folder.rule_folder.uid
+			interval_seconds   = 60
+
+			rule {
+				name = "%[1]s"
+				condition      = "B"
+				notification_settings {
+					contact_point = grafana_contact_point.default_policy.name
+					group_by      = ["..."]
+					mute_timings  = local.use_mute ? [grafana_mute_timing.test[0].name] : []
+				}
+				data {
+					ref_id     = "A"
+					query_type = ""
+					relative_time_range {
+						from = 600
+						to   = 0
+					}
+					datasource_uid = "PD8C576611E62080A"
+					model = jsonencode({
+						hide          = false
+						intervalMs    = 1000
+						maxDataPoints = 43200
+						refId         = "A"
+					})
+				}
+			}
+		}
+
+		
+		resource "grafana_mute_timing" "test" {
+			count = local.use_mute ? 1 : 0
+			name = "%[1]s"
+			intervals {}
+		}`, randomStr, mute)
+	}
+
+	resource.ParallelTest(t, resource.TestCase{
+		ProtoV5ProviderFactories: testutils.ProtoV5ProviderFactories,
+		Steps: []resource.TestStep{
+			{
+				Config: config(true),
+			},
+			{
+				Config: config(false),
+			},
+		},
+	})
+}