Merge pull request #401 from s-urbaniak/up-down-0.4

[backport] jsonnet: add general rules for up/down targets

jsonnet/kube-prometheus/rules/general.libsonnet

+{
+  prometheusRules+:: {
+    groups+: [
+      {
+        name: 'kube-prometheus-general.rules',
+        rules: [
+          {
+            expr: 'count without(instance, pod, node) (up == 1)',
+            record: 'count:up1',
+          },
+          {
+            expr: 'count without(instance, pod, node) (up == 0)',
+            record: 'count:up0',
+          },
+        ],
+      },
+    ],
+  },
+}

jsonnet/kube-prometheus/rules/rules.libsonnet

-(import 'node-rules.libsonnet')
+(import 'node-rules.libsonnet') +
+(import 'general.libsonnet')

manifests/prometheus-rules.yaml

@@ -265,6 +265,12 @@ spec:
     - expr: cluster:node_cpu_seconds_total:rate5m / count(sum(node_cpu_seconds_total)
         BY (instance, cpu))
       record: cluster:node_cpu:ratio
+  - name: kube-prometheus-general.rules
+    rules:
+    - expr: count without(instance, pod, node) (up == 1)
+      record: count:up1
+    - expr: count without(instance, pod, node) (up == 0)
+      record: count:up0
   - name: node-exporter
     rules:
     - alert: NodeFilesystemSpaceFillingUp