Remove predictive filesystem alerts. They're not useful for us at this point.

alerts/githost.rules

-# Use 6 hours of history to predict 24 hours into the future.
-ALERT NodeFilesystemFullSoon
-  IF predict_linear(node_filesystem_avail{fstype=~"ext.|xfs",mountpoint!~"/mnt/(backup-block-for|remote).*"}[6h], 24*60*60) < 0
-  FOR 2h
-  LABELS {
-    severity = "crit",
-  }
-  ANNOTATIONS {
-    summary = "Filesystem is filling up",
-    description = "Filesystem '{{ $labels.mountpoint }}' on {{ $labels.instance }} is filling up and will be full in the next 24 hours",
-    runbook = "troubleshooting/filesystem_alerts.md",
-  }
-
-# Use 12 hours of history to predict 48 hours into the future.
-ALERT NodeFilesystemFullSoon
-  IF predict_linear(node_filesystem_avail{fstype=~"ext.|xfs",mountpoint!~"/mnt/(backup-block-for|remote).*"}[12h], 48*60*60) < 0
-  FOR 4h
-  LABELS {
-    severity = "crit",
-  }
-  ANNOTATIONS {
-    summary = "Filesystem is filling up",
-    description = "Filesystem '{{ $labels.mountpoint }}' on {{ $labels.instance }} is filling up and will be full in the next 48 hours",
-    runbook = "troubleshooting/filesystem_alerts.md",
-  }
-
 ALERT NodeFilesystemFull
   IF ((node_filesystem_avail{fstype=~"ext4|xfs"} / node_filesystem_size{fstype=~"ext4|xfs"}) * 100) <= 20
   FOR 15m