Add tags for resolved alerts

Implements: https://todo.xenrox.net/~xenrox/ntfy-alertmanager/8

README.md

@@ -56,6 +56,11 @@ labels {
     }
 }
 
+# Set tags for resolved alerts
+resolved {
+    tags "resolved,partying_face"
+}
+
 ntfy {
     # URL of the ntfy topic - required
     topic https://ntfy.sh/alertmanager-alerts

config.go

@@ -26,6 +26,7 @@ type config struct {
 	labels      labels
 	cache       cacheConfig
 	am          alertmanagerConfig
+	resolved    resolvedConfig
 }
 
 type ntfyConfig struct {
@@ -56,6 +57,10 @@ type alertmanagerConfig struct {
 	URL             string
 }
 
+type resolvedConfig struct {
+	Tags []string
+}
+
 func readConfig(path string) (*config, error) {
 	cfg, err := scfg.Load(path)
 	if err != nil {
@@ -272,5 +277,18 @@ func readConfig(path string) (*config, error) {
 		}
 	}
 
+	resolvedDir := cfg.Get("resolved")
+	if resolvedDir != nil {
+		d = resolvedDir.Children.Get("tags")
+		if d != nil {
+			var tags string
+			if err := d.ParseParams(&tags); err != nil {
+				return nil, err
+			}
+
+			config.resolved.Tags = strings.Split(tags, ",")
+		}
+	}
+
 	return config, nil
 }

config_test.go

@@ -41,6 +41,10 @@ labels {
     }
 }
 
+resolved {
+    tags "resolved,partying_face"
+}
+
 ntfy {
     # URL of the ntfy topic - required
     topic https://ntfy.sh/alertmanager-alerts
@@ -93,6 +97,9 @@ cache {
 			Password:        "pass",
 			URL:             "https://alertmanager.xenrox.net",
 		},
+		resolved: resolvedConfig{
+			Tags: []string{"resolved", "partying_face"},
+		},
 	}
 
 	configPath := filepath.Join(t.TempDir(), "config")

main.go

@@ -89,6 +89,10 @@ func (rcv *receiver) singleAlertNotifications(p *payload) []*notification {
 		}
 
 		var tags []string
+		if alert.Status == "resolved" {
+			tags = append(tags, rcv.cfg.resolved.Tags...)
+		}
+
 		for _, labelName := range rcv.cfg.labels.Order {
 			val, ok := alert.Labels[labelName]
 			if !ok {
@@ -176,6 +180,10 @@ func (rcv *receiver) multiAlertNotification(p *payload) *notification {
 
 	var priority string
 	var tags []string
+	if p.Status == "resolved" {
+		tags = append(tags, rcv.cfg.resolved.Tags...)
+	}
+
 	for _, labelName := range rcv.cfg.labels.Order {
 		val, ok := p.CommonLabels[labelName]
 		if !ok {