Prometheus alerts (in 1.x format) to monitor a Prometheus 2.0 server

prometheus.rules

ALERT PrometheusTSDBReloadsFailing
  IF increase(prometheus_tsdb_reloads_failures_total[4h]) > 0
  FOR 1d
  LABELS {
    system = "prometheus",
    severity = "warning",
  }
  ANNOTATIONS {
    summary = "Prometheus has issues reloading data blocks from disk",
    description = "{{$labels.job}} at {{$labels.instance}} had {{$value | humanize}} reload failures over the last four hours.",
    runbook = "http://eng-doc/runbooks/prometheus/#prometheustsdbreloadsfailing",
  }

ALERT PrometheusTSDBCompactionsFailing
  IF increase(prometheus_tsdb_compactions_failed_total[4h]) > 0
  FOR 1d
  LABELS {
    system = "prometheus",
    severity = "warning",
  }
  ANNOTATIONS {
    summary = "Prometheus has issues compacting sample blocks",
    description = "{{$labels.job}} at {{$labels.instance}} had {{$value | humanize}} compaction failures over the last four hours.",
    runbook = "http://eng-doc/runbooks/prometheus/#prometheustsdbcompactionsfailing",
  }

ALERT PrometheusTSDBWALCorruptions
  IF tsdb_wal_corruptions_total > 0
  FOR 4h
  LABELS {
    system = "prometheus",
    severity = "warning",
  }
  ANNOTATIONS {
    summary = "Prometheus write-ahead log is corrupted",
    description = "{{$labels.job}} at {{$labels.instance}} has a corrupted write-ahead log (WAL).",
    runbook = "http://eng-doc/runbooks/prometheus/#prometheustsdbwalcorruptions",
  }