Add environmental variable to determine the agent's cluster name (#167) (#171)

Author: musa-asad

charts/amazon-cloudwatch-observability/templates/linux/cloudwatch-agent-custom-resource.yaml

@@ -191,6 +191,8 @@ spec:
     valueFrom:
       fieldRef:
         fieldPath: metadata.namespace
+  - name: K8S_CLUSTER_NAME
+    value: {{ $.Values.clusterName }}
   {{- with $.Values.tolerations }}
   tolerations: {{- toYaml . | nindent 2}}
   {{- end }}