Google Tag Manager.

_ga
Registers a unique ID that is used to generate statistical data on how the visitor uses the website.
Expiry: 2 Years Type: HTTP
_gid
Registers a unique ID that is used to generate statistical data on how the visitor uses the website.
Expiry: 1 Day Type: HTTP
_gat_gtag
Used by Google Analytics to throttle request rate.
Expiry: 1 minute Type: HTTP