Melange

Saves the settings of the cookie banner.

Visitor statistics for website optimization, error analysis, cyber security.

pk_id - 13 months (used to store some details about the user, such as the unique visitor ID)

_pk_ref - 6 months (used to store attribution information, the one originally used to visit the website)

_pk_ses, _pk_cvar, _pk_hsr - 30 minutes (short-lived cookies to temporarily store data for the visit)

_pk_testcookie is created and then should be deleted immediately (to check if the visitor's browser supports cookies)

mtm_consent (or mtm_consent_removed) are created with a 30 year expiration date to remind that consent has been given (or removed) by the user.

mtm_cookie_consent is created with an expiration date of 30 years to remind that consent to store and use cookies has been given by the user.

matomo.org/faq/general/faq_146/