Quiz: alerts

Read the output

The rule is loaded and inactive, although the volume is nearly full. Why?

expr: node_filesystem_avail_bytes{mountpoint="/srv/data"}
      / node_filesystem_size_bytes{mountpoint="/srv/data"} > 0.95

$ promtool query instant http://localhost:9090 '<то же без > 0.95>'
{…, mountpoint="/srv/data"} => 0.0499…

• A The condition keeps volumes with more than 95% free, and 5% is free here.
• B The rule is waiting out its for duration.
• C The volume has no mountpoint label, so the selector is empty.