Description:

We used to allow passing _rcn or _rck as tracking parameters to allow attributing campaigns to visits and conversions. With # we stopped using those parameters for attributing visits. As our FAQs suggested to use those parameters for tracking e.g. email campaigns, we updated the FAQ to use campaign parameters instead. This actually doesn't work, as long as the parameters are not within the tracked url or the tracked referrer (url_ref).

To make it easier to track campaigns when using the image tracker, we should instead allow to directly pass the campaign parameters to our tracker.

fixes #21091

Review

• Functional review done
• Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done
• Wording review done
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• Documentation added if needed
• Existing documentation updated if needed