add appdynamicscloud section to metrics usage doc

Signed-off-by: charleslin-appd <[email protected]>

docs/gitbook/usage/metrics.md

@@ -623,3 +623,68 @@ Reference the template in the canary analysis:
  max: 1000
  interval: 1m
 ```
+
+## AppDynamicsCloud
+
+You can create custom metric checks using the AppDynamicsCloud provider.
+
+Create a secret with your AppDynamicsCloud service principal credential:
+
+```yaml
+apiVersion: v1
+kind: Secret
+metadata:
+ name: appdynamicscloud-secret
+ namespace: istio-system
+data:
+ appdcloud_client_secret_id: your-appdcloud-service-principal-id
+ appdcloud_client_secret_key: your-appdcloud-service-principal-key
+```
+
+AppDynamics metric template examples:
+
+```yaml
+apiVersion: flagger.app/v1beta1
+kind: MetricTemplate
+metadata:
+ name: error-rate 
+ namespace: istio-system
+spec:
+ provider:
+ type: appdynamicscloud
+ address: https://tenant_name.observe.appdynamics.com
+ secretRef:
+ name: appdynamicscloud-secret
+ query: |
+ fetch epm: metrics(apm:errors_min) {timestamp, value} from entities(apm:service)[attributes(service.name) = '{{ target }}_backend'] since -10m
+```
+
+```yaml
+apiVersion: flagger.app/v1beta1
+kind: MetricTemplate
+metadata:
+ name: response-time 
+ namespace: istio-system
+spec:
+ provider:
+ type: appdynamicscloud
+ address: https://tenant_name.observe.appdynamics.com
+ secretRef:
+ name: appdynamicscloud-secret
+ query: |
+ fetch art: metrics(apm:response_time) {timestamp, value} from entities(apm:service)[attributes(service.namespace) = '{{ namespace }}' && attributes(service.name) = '{{ target }}'] since -10m
+```
+
+Reference the template in the canary analysis:
+
+```yaml
+ analysis:
+ metrics:
+ - name: "error-rate"
+ templateRef:
+ name: error-rate
+ namespace: istio-system
+ thresholdRange:
+ max: 1
+ interval: 1m
+```