Update CRDB operator examples and instructions for deprecated fields (#21543)

* Update CRDB operator examples and instructions for deprecated fields

Pritesh feedback

Refactor example and override doc to not require container field

Additional Pritesh feedback

* Backport docs changes

Author: jhlodin

src/current/v25.2/cockroachdb-operator-performance.md

@@ -177,10 +177,12 @@ Once you've picked out an amount of CPU and memory to reserve for Cockroach, con
 ~~~ yaml
 cockroachdb:
   crdbCluster:
-    resources:
-      requests:
-        cpu: 3500m
-        memory: 12300Mi
+    podTemplate:
+      spec:
+        resources:
+          requests:
+            cpu: 3500m
+            memory: 12300Mi
 ~~~
 
 When you initialize the cluster, check that all the CockroachDB pods are scheduled successfully. If you see any get stuck in the pending state, run `kubectl describe pod {podname}` and check the `Events` for information about why they're still pending. You may need to manually preempt pods on one or more nodes by running `kubectl delete pod` on them to make room for the CockroachDB pods. As long as the pods you delete were created by a higher-level Kubernetes object such as a `Deployment`, they'll be safely recreated on another node.
@@ -194,12 +196,14 @@ To set resource limits, in addition to the [resource requests](#resource-request
 ~~~ yaml
 cockroachdb:
   crdbCluster:
-    resources:
-      requests:
-        cpu: 3500m
-        memory: 12300Mi
-      limits:
-        memory: 12300Mi
+    podTemplate:
+      spec:
+        resources:
+          requests:
+            cpu: 3500m
+            memory: 12300Mi
+          limits:
+            memory: 12300Mi
 ~~~
 
 Pods will be limited to their reserved resources and are unlikely to be preempted, except in rare cases. This will not improve performance on an underutilized Kubernetes cluster, but provides more predictable performance as other workloads run.
@@ -266,27 +270,29 @@ Client applications such as benchmarking applications running on the same machin
 ~~~ yaml
 cockroachdb:
   crdbCluster:
-    affinity:
-     podAntiAffinity:
-        preferredDuringSchedulingIgnoredDuringExecution:
-        - weight: 100
-          podAffinityTerm:
-            labelSelector:
-              matchExpressions:
-              - key: app
-                operator: In
-                values:
-                - loadgen
-            topologyKey: kubernetes.io/hostname
-        - weight: 99
-          podAffinityTerm:
-            labelSelector:
-              matchExpressions:
-              - key: app
-                operator: In
-                values:
-                - cockroachdb
-            topologyKey: kubernetes.io/hostname
+    podTemplate:
+      spec:
+        affinity:
+          podAntiAffinity:
+              preferredDuringSchedulingIgnoredDuringExecution:
+              - weight: 100
+                podAffinityTerm:
+                  labelSelector:
+                    matchExpressions:
+                    - key: app
+                      operator: In
+                      values:
+                      - loadgen
+                  topologyKey: kubernetes.io/hostname
+              - weight: 99
+                podAffinityTerm:
+                  labelSelector:
+                    matchExpressions:
+                    - key: app
+                      operator: In
+                      values:
+                      - cockroachdb
+                  topologyKey: kubernetes.io/hostname
 ~~~
 
 The preceding configuration will first prefer to put the `loadgen` pods on different nodes from each other, which is important for the fault tolerance of the `loadgen` pods themselves. As a secondary priority, it will attempt to put the pods on nodes that do not already have a running `CockroachDB` pod. This will ensure the best possible balance of fault tolerance and performance for the load generator and CockroachDB cluster.

src/current/v25.2/configure-cockroachdb-operator.md

@@ -27,18 +27,20 @@ You can set the CPU and memory resources allocated to the CockroachDB container
 1 CPU in Kubernetes is equivalent to 1 vCPU or 1 hyperthread. For best practices on provisioning CPU and memory for CockroachDB, refer to the [Production Checklist]({% link {{ page.version.version }}/recommended-production-settings.md %}#hardware).
 {{site.data.alerts.end}}
 
-Specify CPU and memory values in `cockroachdb.crdbCluster.resources.limits` and `cockroachdb.crdbCluster.resources.requests` in the values file used to [deploy the cluster]({% link {{ page.version.version }}/deploy-cockroachdb-with-cockroachdb-operator.md %}#initialize-the-cluster):
+Specify CPU and memory values in `cockroachdb.crdbCluster.podTemplate.spec.resources.limits` and `cockroachdb.crdbCluster.podTemplate.spec.resources.requests` in the values file used to [deploy the cluster]({% link {{ page.version.version }}/deploy-cockroachdb-with-cockroachdb-operator.md %}#initialize-the-cluster):
 
 ~~~ yaml
 cockroachdb:
   crdbCluster:
-    resources:
-      limits:
-        cpu: 4000m
-        memory: 16Gi
-      requests:
-        cpu: 4000m
-        memory: 16Gi
+    podTemplate:
+      spec:
+        resources:
+          limits:
+            cpu: 4000m
+            memory: 16Gi
+          requests:
+            cpu: 4000m
+            memory: 16gi
 ~~~
 
 Apply the new settings to the cluster:

src/current/v25.2/deploy-cockroachdb-with-cockroachdb-operator.md

@@ -252,7 +252,21 @@ For bare metal deployments, the specific Kubernetes infrastructure deployment st
     If you intend to deploy CockroachDB nodes across multiple different regions, follow the additional steps described in [Deploy across multiple regions](#deploy-across-multiple-regions).
     {{site.data.alerts.callout_end}}
 
-1. Uncomment and modify `cockroachdb.crdbCluster.resources` in the values file with the CPU and memory requests and limits for each node to use. The default values are 4vCPU and 16GiB of memory:
+1. Modify `cockroachdb.crdbCluster.podTemplate.spec.resources` in the values file with the CPU and memory limits and requests for each node to use. For example, to define default values of 4vCPU and 16GiB of memory:
+
+    ~~~ yaml
+    cockroachdb:
+      crdbCluster:
+        podTemplate:
+          spec:
+            resources:
+              limits:
+                cpu: 4000m
+                memory: 16Gi
+              requests:
+                cpu: 4000m
+                memory: 16gi
+    ~~~
 
     For more information on configuring node resource allocation, refer to [Resource management]({% link {{ page.version.version }}/configure-cockroachdb-operator.md %})
 
@@ -435,13 +449,18 @@ For bare metal deployments, the specific Kubernetes infrastructure deployment st
     cockroach start --locality region=us-central1,zone=us-central1-c,dc=dc2
     ~~~
 
-    Optionally, review the `cockroachdb.crdbCluster.topologySpreadConstraints` configuration and set `topologyKey` to the `nodeLabel` value of a locality level that has distinct values for each node. By default the lowest locality level is `zone`, so the following configuration sets that value as the `topologyKey`:
+    Optionally, review the `cockroachdb.crdbCluster.podTemplate.spec.topologySpreadConstraints` configuration and set `topologyKey` to the `nodeLabel` value of a locality level that has distinct values for each node. By default the lowest locality level is `zone`, so the following configuration sets that value as the `topologyKey`:
 
     ~~~ yaml
     cockroachdb:
       crdbCluster:
-        topologySpreadConstraints:
-          topologyKey: topology.kubernetes.io/zone
+        podTemplate:
+          spec:
+            topologySpreadConstraints:
+              # maxSkew defines the degree to which the pods can be unevenly distributed.
+            - maxSkew: 1
+              # topologyKey defines the key for topology spread.
+              topologyKey: topology.kubernetes.io/zone
     ~~~
 
     For more information on localities and topology planning, see the [topology patterns documentation]({% link {{ page.version.version }}/topology-patterns.md %}).

src/current/v25.2/override-templates-cockroachdb-operator.md

@@ -10,7 +10,7 @@ The {{ site.data.products.cockroachdb-operator }} provides abstractions that sim
 - A default pod specification is used for the CockroachDB Kubernetes pod.
 - The `values.yaml` configuration maps to a subset of `cockroach start` flags when CockroachDB is initialized.
 
-This page describes configuration options that allow advanced users to manually override the pod template and `cockroach start` flags as needed for deployment.
+This page describes configuration options that allow advanced users to manually override pod template metadata and `cockroach start` flags as needed for deployment.
 
 {{site.data.alerts.callout_info}}
 The {{ site.data.products.cockroachdb-operator }} is in [Preview]({% link {{ page.version.version }}/cockroachdb-feature-availability.md %}).
@@ -24,6 +24,8 @@ This page describes advanced configurations that override the supported default
 
 The `cockroachdb.crdbCluster.podTemplate` field allows you to override the default pod metadata and specification configured by the {{ site.data.products.cockroachdb-operator }}. The values in this field are merged with the default pod specification, where settings in `podTemplate` override any values in the default.
 
+The `podTemplate` field includes a `containers` field that specifies the container name and image that the template is applied to. By default, this resolves to the `cockroachdb` container name and can be excluded from modifications to the CockroachDB pod template YAML. If needed, you can provide specific images for the `containers` and `initContainers`. For example, the following `podTemplate` configuration specifies a custom init container:
+
 ~~~ yaml
 cockroachdb:
   crdbCluster: