add auto proxy synapse worker metrics

when matrix_nginx_proxy_proxy_synapse_metrics is enabled

roles/matrix-nginx-proxy/defaults/main.yml

@@ -222,7 +222,7 @@ matrix_nginx_proxy_proxy_matrix_client_api_forwarded_location_prefix_regexes: |
     +
     (['/_synapse/admin'] if matrix_nginx_proxy_proxy_matrix_client_api_forwarded_location_synapse_admin_api_enabled else [])
     +
-    (['/_synapse/metrics'] if matrix_nginx_proxy_proxy_synapse_metrics else [])
+    (['/_synapse.*/metrics'] if matrix_nginx_proxy_proxy_synapse_metrics else [])
   }}
 
 # Specifies where requests for the root URI (`/`) on the `matrix.` domain should be redirected.

roles/matrix-nginx-proxy/templates/nginx/conf.d/matrix-synapse.conf.j2

@@ -153,6 +153,24 @@ server {
 	}
 	{% endif %}
 
+	{% if matrix_nginx_proxy_enabled and matrix_nginx_proxy_proxy_synapse_metrics %}
+		{% for worker in matrix_prometheus_scraper_synapse_workers_enabled_list %}
+			{% if worker.metrics_port != 0 %}
+				location /_synapse-worker-{{ worker.type }}-{{ worker.instanceId }}/metrics {
+					resolver 127.0.0.11 valid=5s;
+					set $backend "matrix-synapse-worker-{{ worker.type }}-{{ worker.instanceId }}:{{ worker.metrics_port }}";
+					proxy_pass http://$backend/_synapse/metrics;
+					proxy_set_header Host $host;
+
+					{% if matrix_nginx_proxy_proxy_synapse_metrics_basic_auth_enabled %}
+						auth_basic "protected";
+						auth_basic_user_file /nginx-data/matrix-synapse-metrics-htpasswd;
+					{% endif %}
+				}
+			{% endif %}
+ 		{% endfor %}
+	{% endif %}
+
 	{# Everything else just goes to the API server ##}
 	location / {
 		{% if matrix_nginx_proxy_enabled %}