Log links with parameters that are used to track the source of clicks, likely used by SEO people. Log-only to gauge the scale of the issue. --ST47 2020-02-14

This filter is showing up on the Slow Filter Dashboard on Logstash. added_links is expensive. To reduce unnecessary calls to added_links, we can first check if http or https is in added_lines. ~MA 2021-01-22

Optimize: Don't generate added_links every time someone edits a line containing a link. --Suffusion of Yellow 01:09 29 Oct 2022

/* added_links is expensive; first check added_lines for protocol to reduce unneeded calls to added_links */

tracking := "(?:utm_source|utm_medium|utm_campaign|utm_term|utm_content|gclid|gclsrc|dclid|fbclid|zanpid)=";

added_lines irlike tracking &