dashboard: factor Grafonnet builders into tab modules (#2595)

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

contrib/mixin/dashboards/annotations.libsonnet

@@ -0,0 +1,30 @@
+local b = import 'builders.libsonnet';
+local annotation = b.dashboard.spec.annotations;
+
+[
+  annotation.withKind()
+  + annotation.spec.withBuiltIn(true)
+  + annotation.spec.withEnable(true)
+  + annotation.spec.withHide(true)
+  + annotation.spec.withIconColor('rgba(0, 211, 255, 1)')
+  + annotation.spec.withLegacyOptions({
+    type: 'dashboard',
+  })
+  + annotation.spec.withName('Annotations & Alerts')
+  + annotation.spec.withQuery(b.dataQuery({}, 'grafana', '-- Grafana --'))
+  ,
+  annotation.withKind()
+  + annotation.spec.withEnable(true)
+  + annotation.spec.withHide(false)
+  + annotation.spec.withIconColor('orange')
+  + annotation.spec.withLegacyOptions({
+    expr: 'windows_system_boot_time_timestamp{job=~"$job", instance="$instance"} * 1000 > $__from < $__to',
+    step: '1m',
+    tagKeys: 'instance',
+    textFormat: '',
+    titleFormat: 'Reboot',
+    useValueForTime: 'on',
+  })
+  + annotation.spec.withName('Reboots')
+  + annotation.spec.withQuery(b.dataQuery({}, 'prometheus', '${datasource}')),
+]