Prometheus Query Language

Queries

Predict days until disk full

(-node_filesystem_free_bytes{mountpoint="/",instance="host.you.app:9100"} / deriv(node_filesystem_free_bytes{mountpoint="/"}[24h])) / 3600 / 24

Percentage of failed requests for app

traefik_service_requests_total{service="appname@docker",code="500"} / traefik_service_requests_total{service="appname@docker",code="200"}

Percentage of failed requests for everything

sum(rate(traefik_service_requests_total{code=~"4.*"}[3m])) by (service) / sum(rate(traefik_service_requests_total[3m])) by (service) * 100