Graphite scaler docs (#524)

Signed-off-by: Brandon Pinske <[email protected]>
Co-authored-by: Brandon Pinske <[email protected]>

content/docs/2.5/scalers/graphite.md

@@ -0,0 +1,114 @@
++++
+title = "Graphite"
+layout = "scaler"
+availability = "v2.5+"
+maintainer = "Community"
+description = "Scale applications based on metrics in Graphite."
+go_file = "graphite_scaler"
++++
+
+### Trigger Specification
+
+This specification describes the `graphite` trigger that scales based on metrics in Graphite.
+
+```yaml
+triggers:
+- type: graphite
+  metadata:
+    # Required
+    serverAddress: http://<graphite-host>:81
+    metricName: request-count # Note: name to identify the metric
+    query: stats.counters.http.hello-world.request.count.count # Note: query must return a vector/scalar single element response
+    threshold: '100'
+    queryTime: '-10Minutes' # Note: Query time in from argv Seconds/Minutes/Hours
+```
+**Parameter list:**
+
+- `serverAddress` - Address of Graphite
+- `metricName` - Name to identify the Metric in the external.metrics.k8s.io API. If using more than one trigger it is required that all `metricName`(s) be unique
+- `query` - Query to run
+- `threshold` - Value to start scaling for
+- `queryTime` - Relative time range to execute query against. Please see the [graphite API docs](https://graphite-api.readthedocs.io/en/latest/api.html#from-until) for more information.
+
+### Authentication Parameters
+
+Graphite Scaler supports one type of authentication - basic authentication
+
+**Basic authentication:**
+- `authMode`: It must contain `basic` in case of Basic Authentication. Specify this in trigger configuration.
+- `username`: This is a required field. Provide the username to be used for basic authentication.
+- `password`: Provide the password to be used for authentication. For convenience, this has been marked optional, because many applications implement basic auth with a username as apikey and password as empty.
+
+### Examples
+
+```yaml
+apiVersion: keda.sh/v1alpha1
+kind: ScaledObject
+metadata:
+  name: graphite-scaledobject
+  namespace: default
+spec:
+  scaleTargetRef:
+    name: my-deployment
+  triggers:
+  - type: graphite
+    metadata:
+      serverAddress: http://<graphite-host>:81
+      metricName: LagMetric
+      threshold: '100'
+      query: maxSeries(keepLastValue(reportd.*.gauge.detect.latest_max_time.value, 1))
+      queryTime: '-1Minutes'
+```
+
+Here is an example of a Graphite Scaler with Basic Authentication, define the `Secret` and `TriggerAuthentication` as follows
+
+```yaml
+apiVersion: v1
+kind: Secret
+metadata:
+  name: keda-graphite-secret
+  namespace: default
+data:
+  username: "dXNlcm5hbWUK" # Must be base64
+  password: "cGFzc3dvcmQK"
+---
+apiVersion: keda.sh/v1alpha1
+kind: TriggerAuthentication
+metadata:
+  name: keda-graphite-creds
+  namespace: default
+spec:
+  secretTargetRef:
+    - parameter: username
+      name: keda-graphite-secret
+      key: username
+    - parameter: password
+      name: keda-graphite-secret
+      key: password
+---
+apiVersion: keda.sh/v1alpha1
+kind: ScaledObject
+metadata:
+  name: graphite-scaledobject
+  namespace: default
+  labels:
+    deploymentName: php-apache-graphite
+spec:
+  cooldownPeriod: 10
+  maxReplicaCount: 5
+  minReplicaCount: 0
+  pollingInterval: 5
+  scaleTargetRef:
+    name: php-apache-graphite
+  triggers:
+  - type: graphite
+    metadata:
+      authMode: "basic"
+      metricName: https_metric
+      query: https_metric
+      queryTime: -1Hours
+      serverAddress: http://<graphite server>:81
+      threshold: "100"
+    authenticationRef:
+        name: keda-graphite-creds
+```

content/docs/2.5/scalers/prometheus.md

@@ -131,8 +131,8 @@ metadata:
   name: keda-prom-secret
   namespace: default
 data:
-  username: "username" 
-  password: "password"
+  username: "dXNlcm5hbWUK" # Must be base64
+  password: "cGFzc3dvcmQK"
 ---
 apiVersion: keda.sh/v1alpha1
 kind: TriggerAuthentication