Be able to use Outage docker alerts even if no replicas defined

We should make replicas pillar optional for our Prometheus alerts.

Change-Id: I3b8c33c9d4cd75a2d2a96ce5f4579fea19748ec6
Closes-Bug: PROD-24336
diff --git a/docker/meta/prometheus.yml b/docker/meta/prometheus.yml
index 0059797..6921039 100644
--- a/docker/meta/prometheus.yml
+++ b/docker/meta/prometheus.yml
@@ -28,11 +28,10 @@
 {%- if client.get('enabled', False) %}
   {%- for stack_name, stack in client.get('stack', {})|dictsort %}
     {%- for service_name, service in stack.get('service', {})|dictsort %}
-      {%- if service.get('deploy', {}).replicas is defined %}
-        {%- set full_service_name = "{}_{}".format(stack_name, service_name) %}
-        {%- set camel_case_name = full_service_name.split('_')|map('capitalize')|join('')|replace('-', '') %}
-        {%- set label_selector = 'service_name="{}_{}"'.format(stack_name, service_name) %}
-        {%- if service.deploy.replicas > 1 %}
+      {%- set full_service_name = "{}_{}".format(stack_name, service_name) %}
+      {%- set camel_case_name = full_service_name.split('_')|map('capitalize')|join('')|replace('-', '') %}
+      {%- set label_selector = 'service_name="{}_{}"'.format(stack_name, service_name) %}
+      {%- if service.get('deploy', {}).get('replicas', 1) > 1 %}
     DockerService{{ camel_case_name }}ReplicasDownMinor:
       if: >-
         {{ service.deploy.replicas }} - min(docker_swarm_tasks_running{{ '{' + label_selector + '}' }}) >= {{ service.deploy.replicas }} * {{ monitoring.replicas_failed_warning_threshold_percent }}
@@ -57,7 +56,7 @@
         summary: "{%- endraw %}{{monitoring.replicas_failed_critical_threshold_percent*100}}%{%- raw %} of Docker Swarm '{%- endraw %}{{ full_service_name }}{%- raw %}' service replicas are down"
         description: "{{ $value }} Docker Swarm '{%- endraw %}{{ full_service_name }}{%- raw %}' service replicas are down for 2 minutes."
   {%- endraw %}
-        {%- endif %}
+      {%- endif %}
     DockerService{{ camel_case_name }}Outage:
       if: >-
         docker_swarm_tasks_running{{ '{' + label_selector + '}' }} == 0 or absent(docker_swarm_tasks_running{{ '{' + label_selector + '}' }}) == 1
@@ -70,7 +69,6 @@
         summary: "Docker Swarm '{%- endraw %}{{ full_service_name }}{%- raw %}' service outage"
         description: "All Docker Swarm '{%- endraw %}{{ full_service_name }}{%- raw %}' replicas are down for 2 minutes."
   {%- endraw %}
-      {%- endif %}
     {%- endfor %}
   {%- endfor %}
 {%- endif %}