Add Prometheus alerts

Change-Id: I4ad10555d728d62c8e6504659d30558f95b410ac

prometheus/map.jinja

@@ -17,3 +17,17 @@
   },
 }, merge=salt['pillar.get']('prometheus:exporters')) %}
 {%- do salt['defaults.merge'](exporters, grains.get('prometheus', {}).get('exporters', {}))  %}
+
+{%- set monitoring = salt['grains.filter_by']({
+  'default': {
+    'remote_storage_adapter': {
+      'sent_vs_received_ratio': 10.0,
+      'ignored_vs_sent_ratio': 5.0,
+    },
+  },
+}, grain='os_family', merge=salt['pillar.get']('prometheus:monitoring')) %}
+
+{% set remote_storage_adapter = salt['grains.filter_by']({
+  'default': {
+  },
+}, merge=salt['pillar.get']('prometheus:remote_storage_adapter')) %}

prometheus/meta/prometheus.yml

@@ -1,6 +1,9 @@
-{% raw %}
+{%- if pillar.prometheus is defined %}
+{%- from "prometheus/map.jinja" import server, remote_storage_adapter, monitoring with context %}
 server:
   alert:
+{%- if server.get('enabled', False) %}
+{% raw %}
     PrometheusTargetDown:
       if: 'up != 1'
       labels:
@@ -10,3 +13,29 @@ server:
         summary: 'Prometheus endpoint {{ $labels.instance }} is down'
         description: 'Prometheus endpoint {{ $labels.instance }} is down for job {{ $labels.job }}'
 {% endraw %}
+{%- endif %}
+{%- if remote_storage_adapter.get('enabled', False) %}
+    RemoteStorageAdapterSendingTooSlow:
+      {%- set threshold = monitoring.remote_storage_adapter.sent_vs_received_ratio|float %}
+      if: >-
+        100.0 - (100.0 * sent_samples_total{job="remote_storage_adapter"} / on (job, instance) received_samples_total) > {{ threshold }}
+{% raw %}
+      labels:
+        severity: warning
+        service: remote_storage_adapter
+      annotations:
+        summary: 'Remote storage adapter too slow on {{ $labels.instance }}'
+        description: 'Remote storage adapter can not ingest samples fast enough on {{ $labels.instance }} (current value={{ $value }}%, threshold={%- endraw %}{{ threshold }}%).'
+    RemoteStorageAdapterIgnoredTooHigh:
+      {%- set threshold = monitoring.remote_storage_adapter.ignored_vs_sent_ratio|float %}
+      if: >-
+        100.0 * prometheus_influxdb_ignored_samples_total{job="remote_storage_adapter"} / on (job, instance) sent_samples_total > {{ threshold }}
+{% raw %}
+      labels:
+        severity: warning
+        service: remote_storage_adapter
+      annotations:
+        summary: 'Remote storage adapter receiving too many invalid metrics on {{ $labels.instance }}'
+        description: 'Remote storage adapter is receiving too many invalid metrics on {{ $labels.instance }} (current value={{ $value }}%, threshold={%- endraw %}{{ threshold }}%).'
+{%- endif %}
+{%- endif %}