Simplify slack alert title

admin/prometheus_kubernetes_values.yaml

@@ -46,7 +46,7 @@ alertmanager:
       - channel: "#geosphere"
         send_resolved: true
         color: '{{ if eq .Status "firing" }}danger{{ else }}good{{ end }}'
-        title: '[{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] {{ .GroupLabels.SortedPairs.Values | join " " }} {{ if gt (len .CommonLabels) (len .GroupLabels) }}({{ with .CommonLabels.Remove .GroupLabels.Names }}{{ .Values | join " " }}{{ end }}){{ end }}'
+        title: '[{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] | {{ range .Alerts }}{{ .Annotations.summary }} | {{ end }}'
         text: |-
           {{ range .Alerts }}
             *Alert:* {{ .Annotations.summary }} - `{{ .Labels.severity }}`