I am using Kibana to analyze nginx log. Specifically, I am using a percentile graph of request time. I know that my database server is periodically creating backups, let's say from 00:00 to 01:00.
Is it possible to somehow highlight a certain time period on the graph? That would allow me to see whether my increase of average request time increase is coincidental with the DB maintenance procedure. What would be even better is to somehow use a different data source to highlight these periods: I know when DB backup procedure started and finished each day.