update docs

Signed-off-by: Sanskar Jaiswal <sanskar.jaiswal@weave.works>

charts/flagger/README.md

@@ -179,6 +179,8 @@ The following tables lists the configurable parameters of the Flagger chart and
 | `podPriorityClassName` | PriorityClass name for pod priority configuration | "" |
 | `podDisruptionBudget.enabled` | A PodDisruptionBudget will be created if `true` | `false` |
 | `podDisruptionBudget.minAvailable` | The minimal number of available replicas that will be set in the PodDisruptionBudget | `1` |
+| `podDisruptionBudget.minAvailable` | The minimal number of available replicas that will be set in the PodDisruptionBudget | `1` |
+| `noCrossNamespaceRefs` | If `true`, cross namespace references to custom resources will be disabled. | `false` |
 
 Specify each parameter using the `--set key=value[,key=value]` argument to `helm upgrade`. For example,
 

charts/flagger/templates/deployment.yaml

@@ -141,6 +141,9 @@ spec:
  {{- if .Values.clusterName }}
  - -cluster-name={{ .Values.clusterName }}
  {{- end }}
+ {{- if .Values.noCrossNamespaceRefs }}
+ - -no-cross-namespace-refs={{ .Values.noCrossNamespaceRefs }}
+ {{- end }}
  livenessProbe:
  exec:
  command:

charts/flagger/values.yaml

@@ -165,3 +165,5 @@ podDisruptionBudget:
  minAvailable: 1
 
 podLabels: {}
+
+noCrossNamespaceRefs: false

docs/gitbook/faq.md

@@ -72,6 +72,17 @@ A window of downtime is the intended behavior when the analysis is disabled. Thi
 a Kubernetes deployment initialization works. To avoid this, enable the analysis (`skipAnalysis: true`), wait for the initialization
 to finish, and disable it afterward (`skipAnalysis: false`).
 
+#### How to disable cross namespace references?
+
+Flagger by default can access resources across namespaces (`AlertProivder` and `MetricProvider`). If you're in a multi-tenant enviornemnt
+and wish to disable this, you can do so through the `no-cross-namespace-refs` flag.
+
+```
+flagger \
+ -no-cross-namespace-refs=true \
+ ...
+```
+
 ## Kubernetes services
 
 #### How is an application exposed inside the cluster?