LoadBalancer toggles for master and replica pooler pods (#1799)

* Add support for pooler load balancer

Signed-off-by: Sergey Shatunov <me@prok.pw>

* Rename to enable_master_pooler_load_balancer

Signed-off-by: Sergey Shatunov <me@prok.pw>

* target port should be intval
* enhance pooler e2e test
* add new options to crds.go

Co-authored-by: Sergey Shatunov <me@prok.pw>

docs/administrator.md

@@ -750,6 +750,11 @@ lead to K8s removing this field from the manifest due to its
 Then the resultant manifest will not contain the necessary change, and the
 operator will respectively do nothing with the existing source ranges.
 
+Load balancer services can also be enabled for the [connection pooler](user.md#connection-pooler)
+pods with manifest flags `enableMasterPoolerLoadBalancer` and/or
+`enableReplicaPoolerLoadBalancer` or in the operator configuration with
+`enable_master_pooler_load_balancer` and/or `enable_replica_pooler_load_balancer`.
+
 ## Running periodic 'autorepair' scans of K8s objects
 
 The Postgres Operator periodically scans all K8s objects belonging to each

docs/reference/cluster_manifest.md

@@ -91,11 +91,23 @@ These parameters are grouped directly under  the `spec` key in the manifest.
   `enable_master_load_balancer` parameter) to define whether to enable the load
   balancer pointing to the Postgres primary. Optional.
 
+* **enableMasterPoolerLoadBalancer**
+  boolean flag to override the operator defaults (set by the
+  `enable_master_pooler_load_balancer` parameter) to define whether to enable
+  the load balancer for master pooler pods pointing to the Postgres primary.
+  Optional.
+
 * **enableReplicaLoadBalancer**
   boolean flag to override the operator defaults (set by the
   `enable_replica_load_balancer` parameter) to define whether to enable the
   load balancer pointing to the Postgres standby instances. Optional.
 
+* **enableReplicaPoolerLoadBalancer**
+  boolean flag to override the operator defaults (set by the
+  `enable_replica_pooler_load_balancer` parameter) to define whether to enable
+  the load balancer for replica pooler pods pointing to the Postgres standby
+  instances. Optional.
+
 * **allowedSourceRanges**
   when one or more load balancers are enabled for the cluster, this parameter
   defines the comma-separated range of IP networks (in CIDR-notation). The

docs/reference/operator_parameters.md

@@ -546,11 +546,21 @@ In the CRD-based configuration they are grouped under the `load_balancer` key.
   toggles service type load balancer pointing to the master pod of the cluster.
   Can be overridden by individual cluster settings. The default is `true`.
 
-* **enable_replica_load_balancer**
-  toggles service type load balancer pointing to the replica pod of the
-  cluster.  Can be overridden by individual cluster settings. The default is
+* **enable_master_pooler_load_balancer**
+  toggles service type load balancer pointing to the master pooler pod of the
+  cluster. Can be overridden by individual cluster settings. The default is
   `false`.
 
+* **enable_replica_load_balancer**
+  toggles service type load balancer pointing to the replica pod(s) of the
+  cluster. Can be overridden by individual cluster settings. The default is
+  `false`.
+
+* **enable_replica_pooler_load_balancer**
+  toggles service type load balancer pointing to the replica pooler pod(s) of
+  the cluster. Can be overridden by individual cluster settings. The default
+  is `false`.
+
 * **external_traffic_policy** defines external traffic policy for load
   balancers. Allowed values are `Cluster` (default) and `Local`.