Remove Divisor from Downward API resrouceFieldRefs

This means CPU and memory information will now be exposed using the default
divisor for CPU and memory (with default being "1" for both).  This means memory
information will now be represented in bytes, as expected by pgMonitor and the
CPK Metrics & Monitoring stack when  consuming Downward API information.

Issue: PGO-2604

Author: sfc-gh-alecuyer

internal/postgres/reconcile.go

@@ -8,7 +8,6 @@ import (
 	"context"
 
 	corev1 "k8s.io/api/core/v1"
-	"k8s.io/apimachinery/pkg/api/resource"
 
 	"github.com/crunchydata/postgres-operator/internal/config"
 	"github.com/crunchydata/postgres-operator/internal/feature"
@@ -17,11 +16,6 @@ import (
 	"github.com/crunchydata/postgres-operator/pkg/apis/postgres-operator.crunchydata.com/v1beta1"
 )
 
-var (
-	oneMillicore = resource.MustParse("1m")
-	oneMebibyte  = resource.MustParse("1Mi")
-)
-
 // DataVolumeMount returns the name and mount path of the PostgreSQL data volume.
 func DataVolumeMount() corev1.VolumeMount {
 	return corev1.VolumeMount{Name: "postgres-data", MountPath: dataMountPath}
@@ -116,28 +110,24 @@ func InstancePod(ctx context.Context,
 					ResourceFieldRef: &corev1.ResourceFieldSelector{
 						ContainerName: naming.ContainerDatabase,
 						Resource:      "limits.cpu",
-						Divisor:       oneMillicore,
 					},
 				}, {
 					Path: "cpu_request",
 					ResourceFieldRef: &corev1.ResourceFieldSelector{
 						ContainerName: naming.ContainerDatabase,
 						Resource:      "requests.cpu",
-						Divisor:       oneMillicore,
 					},
 				}, {
 					Path: "mem_limit",
 					ResourceFieldRef: &corev1.ResourceFieldSelector{
 						ContainerName: naming.ContainerDatabase,
 						Resource:      "limits.memory",
-						Divisor:       oneMebibyte,
 					},
 				}, {
 					Path: "mem_request",
 					ResourceFieldRef: &corev1.ResourceFieldSelector{
 						ContainerName: naming.ContainerDatabase,
 						Resource:      "requests.memory",
-						Divisor:       oneMebibyte,
 					},
 				}, {
 					Path: "labels",

internal/postgres/reconcile_test.go

@@ -351,22 +351,22 @@ volumes:
     - path: cpu_limit
       resourceFieldRef:
         containerName: database
-        divisor: 1m
+        divisor: "0"
         resource: limits.cpu
     - path: cpu_request
       resourceFieldRef:
         containerName: database
-        divisor: 1m
+        divisor: "0"
         resource: requests.cpu
     - path: mem_limit
       resourceFieldRef:
         containerName: database
-        divisor: 1Mi
+        divisor: "0"
         resource: limits.memory
     - path: mem_request
       resourceFieldRef:
         containerName: database
-        divisor: 1Mi
+        divisor: "0"
         resource: requests.memory
     - fieldRef:
         apiVersion: v1
@@ -442,22 +442,22 @@ volumes:
     - path: cpu_limit
       resourceFieldRef:
         containerName: database
-        divisor: 1m
+        divisor: "0"
         resource: limits.cpu
     - path: cpu_request
       resourceFieldRef:
         containerName: database
-        divisor: 1m
+        divisor: "0"
         resource: requests.cpu
     - path: mem_limit
       resourceFieldRef:
         containerName: database
-        divisor: 1Mi
+        divisor: "0"
         resource: limits.memory
     - path: mem_request
       resourceFieldRef:
         containerName: database
-        divisor: 1Mi
+        divisor: "0"
         resource: requests.memory
     - fieldRef:
         apiVersion: v1
@@ -666,22 +666,22 @@ volumes:
     - path: cpu_limit
       resourceFieldRef:
         containerName: database
-        divisor: 1m
+        divisor: "0"
         resource: limits.cpu
     - path: cpu_request
       resourceFieldRef:
         containerName: database
-        divisor: 1m
+        divisor: "0"
         resource: requests.cpu
     - path: mem_limit
       resourceFieldRef:
         containerName: database
-        divisor: 1Mi
+        divisor: "0"
         resource: limits.memory
     - path: mem_request
       resourceFieldRef:
         containerName: database
-        divisor: 1Mi
+        divisor: "0"
         resource: requests.memory
     - fieldRef:
         apiVersion: v1