Add fabric-gateway-controller snapshotting support

There is a plan to enable this feature first gradually on Zalando clusters,
so there is some snapshot for every FabricGateway being created together with
the StackSet.

Signed-off-by: Roman Zavodskikh <[email protected]>

Author: Roman Zavodskikh

cluster/config-defaults.yaml

@@ -337,6 +337,7 @@ fabric_gateway_controller_enabled: "true"
 fabric_gateway_controller_cpu: "50m"
 fabric_gateway_controller_memory: "150Mi"
 fabric_gateway_controller_allow_all_filters: "false"
+fabric_gateway_controller_snapshots_history_limit: "0"
 fabric_gateway_controller_enable_versioning: "false"
 fabric_gateway_controller_ssl_policy: ""
 fabric_gateway_controller_log_level: "INFO"

cluster/manifests/fabric-gateway/deployment.yaml

@@ -1,4 +1,4 @@
-# {{ $version := "master-265" }}
+# {{ $version := "master-274" }}
 apiVersion: apps/v1
 kind: Deployment
 metadata:
@@ -47,6 +47,9 @@ spec:
             {{ if eq .Cluster.ConfigItems.fabric_gateway_controller_allow_all_filters "true" }}
             - -allow-all-filters=true
             {{ end }}
+            {{ if ne .Cluster.ConfigItems.fabric_gateway_controller_snapshots_history_limit "0" }}
+            - -snapshots-history-limit={{ .Cluster.ConfigItems.fabric_gateway_controller_snapshots_history_limit }}
+            {{ end }}
             {{ if eq .Cluster.ConfigItems.fabric_gateway_controller_enable_versioning "true" }}
             - -enable-versioning=true
             {{ end }}