update prometheus-config to new format

contrib/prometheus/README

@@ -5,15 +5,20 @@ To use it, first install prometheus by following the instructions at
 
   http://prometheus.io/
 
-Then add a new job to the main prometheus.conf file:
+Then add a new job to the main prometheus.yml file:
 
-  job: {
-    name: "synapse"
+  - job_name: "synapse"
+    metrics_path: "/_synapse/metrics"
+    # when endpoint uses https:
+    scheme: "https"
 
-    target_group: {
-      target: "http://SERVER.LOCATION.HERE:PORT/_synapse/metrics"
-    }
-  }
+    static_configs:
+    - targets: ['SERVER.LOCATION:PORT']
+
+To use `synapse.rules` add
+
+    rule_files:
+      - "/PATH/TO/synapse.rules"
 
 Metrics are disabled by default when running synapse; they must be enabled
 with the 'enable-metrics' option, either in the synapse config file or as a

contrib/prometheus/synapse.rules

-synapse_federation_transaction_queue_pendingEdus:total = sum(synapse_federation_transaction_queue_pendingEdus or absent(synapse_federation_transaction_queue_pendingEdus)*0)
-synapse_federation_transaction_queue_pendingPdus:total = sum(synapse_federation_transaction_queue_pendingPdus or absent(synapse_federation_transaction_queue_pendingPdus)*0)
+groups:
+- name: synapse
+  rules:
+  - record: "synapse_federation_transaction_queue_pendingEdus:total"
+    expr: "sum(synapse_federation_transaction_queue_pendingEdus or absent(synapse_federation_transaction_queue_pendingEdus)*0)"
+  - record: "synapse_federation_transaction_queue_pendingPdus:total"
+    expr:   "sum(synapse_federation_transaction_queue_pendingPdus or absent(synapse_federation_transaction_queue_pendingPdus)*0)"
+  - record: 'synapse_http_server_requests:method'
+    labels:
+      servlet: ""
+    expr: "sum(synapse_http_server_requests) by (method)"
+  - record: 'synapse_http_server_requests:servlet'
+    labels:
+      method: ""
+    expr: 'sum(synapse_http_server_requests) by (servlet)'
 
-synapse_http_server_requests:method{servlet=""} = sum(synapse_http_server_requests) by (method)
-synapse_http_server_requests:servlet{method=""} = sum(synapse_http_server_requests) by (servlet)
+  - record: 'synapse_http_server_requests:total'
+    labels:
+      servlet: ""
+    expr: 'sum(synapse_http_server_requests:by_method) by (servlet)'
 
-synapse_http_server_requests:total{servlet=""} = sum(synapse_http_server_requests:by_method) by (servlet)
+  - record: 'synapse_cache:hit_ratio_5m'
+    expr: 'rate(synapse_util_caches_cache:hits[5m]) / rate(synapse_util_caches_cache:total[5m])'
+  - record: 'synapse_cache:hit_ratio_30s'
+    expr: 'rate(synapse_util_caches_cache:hits[30s]) / rate(synapse_util_caches_cache:total[30s])'
 
-synapse_cache:hit_ratio_5m = rate(synapse_util_caches_cache:hits[5m]) / rate(synapse_util_caches_cache:total[5m])
-synapse_cache:hit_ratio_30s = rate(synapse_util_caches_cache:hits[30s]) / rate(synapse_util_caches_cache:total[30s])
+  - record: 'synapse_federation_client_sent'
+    labels:
+      type: "EDU"
+    expr: 'synapse_federation_client_sent_edus + 0'
+  - record: 'synapse_federation_client_sent'
+    labels:
+      type: "PDU"
+    expr: 'synapse_federation_client_sent_pdu_destinations:count + 0'
+  - record: 'synapse_federation_client_sent'
+    labels:
+      type: "Query"
+    expr: 'sum(synapse_federation_client_sent_queries) by (job)'
 
-synapse_federation_client_sent{type="EDU"} = synapse_federation_client_sent_edus + 0
-synapse_federation_client_sent{type="PDU"} = synapse_federation_client_sent_pdu_destinations:count + 0
-synapse_federation_client_sent{type="Query"} = sum(synapse_federation_client_sent_queries) by (job)
+  - record: 'synapse_federation_server_received'
+    labels:
+      type: "EDU"
+    expr: 'synapse_federation_server_received_edus + 0'
+  - record: 'synapse_federation_server_received'
+    labels:
+      type: "PDU"
+    expr: 'synapse_federation_server_received_pdus + 0'
+  - record: 'synapse_federation_server_received'
+    labels:
+      type: "Query"
+    expr: 'sum(synapse_federation_server_received_queries) by (job)'
 
-synapse_federation_server_received{type="EDU"} = synapse_federation_server_received_edus + 0
-synapse_federation_server_received{type="PDU"} = synapse_federation_server_received_pdus + 0
-synapse_federation_server_received{type="Query"} = sum(synapse_federation_server_received_queries) by (job)
-
-synapse_federation_transaction_queue_pending{type="EDU"} = synapse_federation_transaction_queue_pending_edus + 0
-synapse_federation_transaction_queue_pending{type="PDU"} = synapse_federation_transaction_queue_pending_pdus + 0
+  - record: 'synapse_federation_transaction_queue_pending'
+    labels:
+      type: "EDU"
+    expr: 'synapse_federation_transaction_queue_pending_edus + 0'
+  - record: 'synapse_federation_transaction_queue_pending'
+    labels:
+      type: "PDU"
+    expr: 'synapse_federation_transaction_queue_pending_pdus + 0'