[qwertox]

Is it now possible to create a horizontal lined based on a single value (either a fixed or a computed number)?

For example when I'm tracking the power grid frequency, I would like to add two lines at 50.05 and 49.95 Hz, as well as one at 50 Hz (with different color).

Others have voiced their desire to display a horizontal line at the 95th percentile in a bandwidth usage graph.

[danlimerick]

Maybe the thresholds feature in Grafana would work for you?

Otherwise depending on the database, they have functions for drawing lines or you can do a hack like this one for Prometheus:

https://play.grafana.org/d/h1lglb7ik/threshold-hack?editPane...