Remove support for Ruby string interpolation in Prometheus queries
Remove support for using Ruby interpolation format (string_%{variable}_string
) in Prometheus queries and custom dashboards.
Since we're adding support for Liquid template formats in !20793 (merged), we should deprecate and remove support for the Ruby interpolation format in the next major version release.
The Ruby interpolation format limits what we can do since it has security and performance issues when the string and variables are user controlled. See !19994 (comment 245546814) for more details on issues with the Ruby interpolation format when both the string and variables are user controlled.
Edited by Reuben Pereira