add startupProbe to account for long warmup time and tune the readiness probe (#60383)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jmoody

config/kubernetes/default/deployments/webapp.yaml

@@ -65,10 +65,18 @@ spec:
             preStop:
               exec:
                 command: ['sleep', '5']
-          readinessProbe:
+          startupProbe:
+            httpGet:
+              path: /healthcheck
+              port: http
             initialDelaySeconds: 5
+            periodSeconds: 5
+            failureThreshold: 12
+            timeoutSeconds: 5
+          readinessProbe:
+            timeoutSeconds: 5
+            periodSeconds: 10
+            failureThreshold: 3
             httpGet:
-              # WARNING: This should be updated to a meaningful endpoint for your application which will return a 200 once the app is fully started.
-              # See: https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/#define-readiness-probes
               path: /healthcheck
               port: http

config/kubernetes/production/deployments/webapp.yaml

@@ -68,10 +68,18 @@ spec:
             preStop:
               exec:
                 command: ['sleep', '5']
-          readinessProbe:
+          startupProbe:
+            httpGet:
+              path: /healthcheck
+              port: http
             initialDelaySeconds: 5
+            periodSeconds: 5
+            failureThreshold: 12
+            timeoutSeconds: 5
+          readinessProbe:
+            timeoutSeconds: 5
+            periodSeconds: 10
+            failureThreshold: 3
             httpGet:
-              # WARNING: This should be updated to a meaningful endpoint for your application which will return a 200 once the app is fully started.
-              # See: https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/#define-readiness-probes
               path: /healthcheck
               port: http