Add license header to fix CI

Signed-off-by: Mustafain Ali Khan <mustalik@amazon.com>

rules/alerting.go

@@ -42,6 +42,7 @@ const (
 	alertMetricName = "ALERTS"
 	// AlertForStateMetricName is the metric name for 'for' state of alert.
 	alertForStateMetricName = "ALERTS_FOR_STATE"
+
 	// AlertStateLabel is the label name indicating the state of an alert.
 	alertStateLabel = "alertstate"
 )
@@ -577,6 +578,8 @@ func (r *AlertingRule) sendAlerts(ctx context.Context, ts time.Time, resendDelay
 	notifyFunc(ctx, r.vector.String(), alerts...)
 }
 
+// Note that changing format of String() changes value of GetFingerprint() leading to loss of persisted state
+// when the `alert-state-persistence` feature is enabled.
 func (r *AlertingRule) String() string {
 	ar := rulefmt.Rule{
 		Alert:         r.name,

rules/manager.go

@@ -129,7 +129,7 @@ type ManagerOptions struct {
 	RuleDependencyController  RuleDependencyController
 	AlertStore                AlertStore
 
-	Metrics                   *Metrics
+	Metrics *Metrics
 }
 
 // NewManager returns an implementation of Manager, ready to be started

rules/store.go

@@ -1,3 +1,16 @@
+// Copyright 2024 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package rules
 
 import (
@@ -65,9 +78,9 @@ func (s *FileStore) initState(registerer prometheus.Registerer) {
 	var data *FileData
 	err = json.NewDecoder(file).Decode(&data)
 	if err != nil {
-		data = nil
 		s.logger.Error("Failed reading alerts state from file", "err", err)
 		s.storeInitErrors.Inc()
+		return
 	}
 	alertsByRule := make(map[uint64][]*Alert)
 	if data != nil && data.Alerts != nil {

rules/store_test.go

@@ -1,3 +1,16 @@
+// Copyright 2024 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package rules
 
 import (
@@ -6,9 +19,9 @@ import (
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/common/promslog"
 	"github.com/stretchr/testify/require"
 
-	"github.com/prometheus/common/promslog"
 	"github.com/prometheus/prometheus/model/labels"
 )