website app /healthz endpoints used for kubernetes health check (#717)

* website app /healthz endpoints used for kubernetes health check

* Add startup and liveness probe

deployment/website.yaml.tmpl

@@ -55,10 +55,23 @@ spec:
           args: []
           ports:
             - containerPort: 8080
+          startupProbe:
+            httpGet:
+              path: /healthz
+              port: 8080
+            failureThreshold: 30
+            periodSeconds: 5
+          livenessProbe:
+            httpGet:
+              path: /healthz
+              port: 8000
+            failureThreshold: 1
+            periodSeconds: 10
           readinessProbe:
             httpGet:
-              path: /about
+              path: /healthz
               port: 8080
+            periodSeconds: 10
           volumeMounts:
             - name: website-robot-key
               mountPath: /var/secrets/google

server/main.py

@@ -74,6 +74,11 @@ def search():
     return flask.render_template('search.html')
 
 
+@app.route('/healthz')
+def healthz():
+    return "very healthy"
+
+
 @app.route('/search_dc')
 def search_dc():
     """Add DC API powered search for non-place searches temporarily"""