feat(config): add cluster option to alertmanager instances

internal/config/config.go

@@ -358,6 +358,7 @@ func (config *configSchema) LogValues() {
 	servers := []AlertmanagerConfig{}
 	for _, s := range cfg.Alertmanager.Servers {
 		server := AlertmanagerConfig{
+			Cluster:     s.Cluster,
 			Name:        s.Name,
 			URI:         uri.SanitizeURI(s.URI),
 			ExternalURI: uri.SanitizeURI(s.ExternalURI),

internal/config/config_test.go

@@ -33,7 +33,8 @@ authorization:
 alertmanager:
   interval: 1s
   servers:
-  - name: default
+  - cluster: ""
+    name: default
     uri: http://localhost
     external_uri: http://example.com
     timeout: 40s

internal/config/models.go

@@ -10,6 +10,7 @@ type AlertmanagerCORS struct {
 }
 
 type AlertmanagerConfig struct {
+	Cluster     string
 	Name        string
 	URI         string
 	ExternalURI string `yaml:"external_uri" koanf:"external_uri"`
@@ -70,6 +71,7 @@ type configSchema struct {
 	Alertmanager struct {
 		Interval    time.Duration
 		Servers     []AlertmanagerConfig
+		Cluster     string           `yaml:"-" koanf:"cluster"`
 		Name        string           `yaml:"-" koanf:"name"`
 		Timeout     time.Duration    `yaml:"-" koanf:"timeout"`
 		URI         string           `yaml:"-" koanf:"uri"`