Merge pull request #2684 from alphagov/healthcheck

Up API health check timeout to 2.5 seconds

manifest.yml.j2

@@ -9,6 +9,7 @@
       'production': ['api.notifications.service.gov.uk'],
     },
     'health-check-type': 'port',
+    'health-check-invocation-timeout': 2.5,
     'instances': {
       'preview': None,
       'staging': None,
@@ -58,6 +59,7 @@ applications:
       {%- endfor%}
       - route: {{ CF_APP }}-{{ environment }}.cloudapps.digital
     health-check-type: {{ app.get('health-check-type', 'process') }}
+    health-check-invocation-timeout: {{ app.get('health-check-invocation-timeout', 1) }}
 
     services:
       - notify-db