Add Prometheus alerts from kube-prometheus, remove the alertmanager alerts.

Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>

documentation/prometheus-mixin/alerts.libsonnet

@@ -5,7 +5,7 @@
         name: 'prometheus',
         rules: [
           {
-            alert: 'PromBadConfig',
+            alert: 'PrometheusBadConfig',
             expr: |||
               prometheus_config_last_reload_successful{%(prometheusSelector)s} == 0
             ||| % $._config,
@@ -14,37 +14,134 @@
               severity: 'critical',
             },
             annotations: {
-              mesage: 'Prometheus failed to reload config, see container logs',
+              message: 'Prometheus failed to reload config, see container logs',
             },
           },
           {
-            alert: 'PromAlertmanagerBadConfig',
+            alert: 'PrometheusNotificationQueueRunningFull',
             expr: |||
-              alertmanager_config_last_reload_successful{%(alertmanagerSelector)s} == 0
+              predict_linear(prometheus_notifications_queue_length{%(prometheusSelector)s}[5m], 60 * 30)
+              >
+              prometheus_notifications_queue_capacity{%(prometheusSelector)s}
             ||| % $._config,
-            'for': '10m',
+            'for': '15m',
             labels: {
-              severity: 'critical',
+              severity: 'warning',
+            },
+            annotations: {
+              message: "Prometheus' alert notification queue is running full for {{$labels.namespace}}/{{ $labels.pod}}",
+            },
+          },
+          {
+            alert: 'PrometheusErrorSendingAlerts',
+            expr: |||
+              100 * rate(prometheus_notifications_errors_total{%(prometheusSelector)s}[5m])
+              /
+              rate(prometheus_notifications_sent_total{%(prometheusSelector)s}[5m]) > 1
+            ||| % $._config,
+            'for': '15m',
+            labels: {
+              severity: 'warning',
             },
             annotations: {
-              message: 'Alertmanager failed to reload config, see container logs',
+              message: '{{ printf "%.1f" $value }}% errors while sending alerts from Prometheus {{$labels.namespace}}/{{ $labels.pod}} to Alertmanager {{$labels.Alertmanager}}',
             },
           },
           {
-            alert: 'PromAlertsFailed',
+            alert: 'PrometheusErrorSendingAlerts',
             expr: |||
-              100 * rate(alertmanager_notifications_failed_total{%(alertmanagerSelector)s}[5m]) / rate(alertmanager_notifications_total{%(alertmanagerSelector)s}[5m]) > 1
+              100 * rate(prometheus_notifications_errors_total{%(prometheusSelector)s}[5m])
+              /
+              rate(prometheus_notifications_sent_total{%(prometheusSelector)s}[5m]) > 3
             ||| % $._config,
-            'for': '5m',
+            'for': '15m',
             labels: {
               severity: 'critical',
             },
             annotations: {
-              message: 'Alertmanager failed to send {{ printf "%.1f" $value }}% alerts to {{ $labels.integration }}.',
+              message: '{{ printf "%.1f" $value }}% errors while sending alerts from Prometheus {{$labels.namespace}}/{{ $labels.pod}} to Alertmanager {{$labels.Alertmanager}}',
+            },
+          },
+          {
+            alert: 'PrometheusNotConnectedToAlertmanagers',
+            expr: |||
+              prometheus_notifications_alertmanagers_discovered{%(prometheusSelector)s} < 1
+            ||| % $._config,
+            'for': '10m',
+            labels: {
+              severity: 'warning',
+            },
+            annotations: {
+              message: 'Prometheus {{ $labels.namespace }}/{{ $labels.pod}} is not connected to any Alertmanagers',
+            },
+          },
+          {
+            alert: 'PrometheusTSDBReloadsFailing',
+            expr: |||
+              increase(prometheus_tsdb_reloads_failures_total{%(prometheusSelector)s}[2h]) > 0
+            ||| % $._config,
+            'for': '12h',
+            labels: {
+              severity: 'warning',
+            },
+            annotations: {
+              message: '{{$labels.job}} at {{$labels.instance}} had {{$value | humanize}} reload failures over the last four hours.',
+            },
+          },
+          {
+            alert: 'PrometheusTSDBCompactionsFailing',
+            expr: |||
+              increase(prometheus_tsdb_compactions_failed_total{%(prometheusSelector)s}[2h]) > 0
+            ||| % $._config,
+            'for': '12h',
+            labels: {
+              severity: 'warning',
+            },
+            annotations: {
+              message: '{{$labels.job}} at {{$labels.instance}} had {{$value | humanize}} compaction failures over the last four hours.',
+            },
+          },
+          {
+            alert: 'PrometheusTSDBWALCorruptions',
+            expr: |||
+              tsdb_wal_corruptions_total{%(prometheusSelector)s} > 0
+            ||| % $._config,
+            'for': '4h',
+            labels: {
+              severity: 'warning',
+            },
+            annotations: {
+              message: '{{$labels.job}} at {{$labels.instance}} has a corrupted write-ahead log (WAL).',
+            },
+          },
+          {
+            alert: 'PrometheusNotIngestingSamples',
+            expr: |||
+              rate(prometheus_tsdb_head_samples_appended_total{%(prometheusSelector)s}[5m]) <= 0
+            ||| % $._config,
+            'for': '10m',
+            labels: {
+              severity: 'warning',
+            },
+            message: {
+              description: "Prometheus {{ $labels.namespace }}/{{ $labels.pod}} isn't ingesting samples.",
+            },
+          },
+          {
+            alert: 'PrometheusTargetScrapesDuplicate',
+            expr: |||
+              increase(prometheus_target_scrapes_sample_duplicate_timestamp_total{%(prometheusSelector)s}[5m]) > 0
+            ||| % $._config,
+            'for': '10m',
+            labels: {
+              severity: 'warning',
+            },
+            annotations: {
+              message: '{{$labels.namespace}}/{{$labels.pod}} has many samples rejected due to duplicate timestamps but different values',
             },
           },
           {
-            alert: 'PromRemoteStorageFailures',
+            alert: 'PrometheusRemoteStorageFailures',
             expr: |||
               (rate(prometheus_remote_storage_failed_samples_total{%(prometheusSelector)s}[1m]) * 100)
                 /
@@ -60,7 +157,7 @@
             },
           },
           {
-            alert: 'PromRuleFailures',
+            alert: 'PrometheusRuleFailures',
             'for': '15m',
             expr: |||
               rate(prometheus_rule_evaluation_failures_total{%(prometheusSelector)s}[1m]) > 0