support configuring replicas for balancerd and console in MZ CR

Author: alex-hunt-materialize

src/cloud-resources/src/crd/materialize.rs

@@ -99,6 +99,10 @@ pub mod v1alpha1 {
         pub balancerd_resource_requirements: Option<ResourceRequirements>,
         // Resource requirements for the console pod
         pub console_resource_requirements: Option<ResourceRequirements>,
+        // Number of balancerd pods to create
+        pub balancerd_replicas: Option<i32>,
+        // Number of console pods to create
+        pub console_replicas: Option<i32>,
 
         // Name of the kubernetes service account to use.
         // If not set, we will create one with the same name as this Materialize object.
@@ -268,6 +272,14 @@ pub mod v1alpha1 {
             self.name_prefixed("balancerd-external-tls")
         }
 
+        pub fn balancerd_replicas(&self) -> i32 {
+            self.spec.balancerd_replicas.unwrap_or(2)
+        }
+
+        pub fn console_replicas(&self) -> i32 {
+            self.spec.console_replicas.unwrap_or(2)
+        }
+
         pub fn console_configmap_name(&self) -> String {
             self.name_prefixed("console")
         }

src/orchestratord/src/controller/materialize/balancer.rs

@@ -320,7 +320,7 @@ fn create_balancerd_deployment_object(
     };
 
     let deployment_spec = DeploymentSpec {
-        replicas: Some(1),
+        replicas: Some(mz.balancerd_replicas()),
         selector: LabelSelector {
             match_labels: Some(pod_template_labels.clone()),
             ..Default::default()

src/orchestratord/src/controller/materialize/console.rs

@@ -395,7 +395,7 @@ ssl_certificate_key /nginx/tls/tls.key;",
     };
 
     let deployment_spec = DeploymentSpec {
-        replicas: Some(2),
+        replicas: Some(mz.console_replicas()),
         selector: LabelSelector {
             match_labels: Some(pod_template_labels.clone()),
             ..Default::default()