[Issue] fix(pagecache): expand Varnish tracking parameter strip list

This issue is automatically created based on existing pull request: magento/magento2#40656: fix(pagecache): expand Varnish tracking parameter strip list

---

Description

Expand the marketing/tracking query string parameter strip list in vcl_recv to cover additional platforms and tools commonly used with Magento stores. These parameters are irrelevant to page content and cause cache fragmentation, reducing cache hit ratio.

Parameter Reference

Google

Parameter	Purpose
utm_*	Campaign tracking (source, medium, campaign, term, content)
gclid	Google Ads click identifier
gclsrc	Google Ads click source type (e.g. aw.ds for Search Ads 360)
gad_source	Google Ads source identifier (added 2024)
gbraid	Google Ads iOS click identifier (privacy-safe)
wbraid	Google Ads web-to-app attribution identifier
dclid	DoubleClick (Google Marketing Platform) click identifier
srsltid	Google Shopping / Merchant Center result identifier
_ga	NEW — Google Analytics cross-domain linker parameter
_gl	Google Analytics / Google Ads cross-domain linker
gdf*	NEW — Google Dynamic Feed parameters
cx	Google Custom Search Engine identifier
ie	Google Search character encoding parameter
cof	Google Search result formatting parameter
siteurl	Google Search site URL parameter

Meta (Facebook / Instagram)

Parameter	Purpose
fbclid	Facebook click identifier (appended to all outbound links)
igshid	NEW — Instagram share identifier

Microsoft

Parameter	Purpose
msclkid	Microsoft Advertising (Bing Ads) click identifier

Adobe

Parameter	Purpose
ef_id	NEW — Adobe Advertising (formerly Adobe Media Optimizer) click ID
s_kwcid	NEW — Adobe Analytics Search keyword campaign ID (AMO ID)
sc_cid (as ScCid)	NEW — Adobe Campaign tracking identifier

Matomo / Piwik (open-source analytics)

Parameter	Purpose
mtm_* / matomo_*	NEW — Matomo campaign tracking parameters (source, medium, keyword, etc.)
pk_* / piwik_*	NEW — Piwik (legacy Matomo) campaign tracking parameters

HubSpot

Parameter	Purpose
hsa_*	NEW — HubSpot Ads tracking parameters (source, campaign, ad group, etc.)

Klaviyo

Parameter	Purpose
_ke	NEW — Klaviyo email click tracking identifier
_kx	Klaviyo email link tracking hash

Affiliate / Partner Networks

Parameter	Purpose
zanpid	Zanox (Awin) affiliate click identifier
tduid	NEW — Tradedoubler affiliate tracking unique ID
campid	NEW — eBay Partner Network campaign identifier
customid	NEW — eBay Partner Network custom tracking ID

Bronto / Oracle Marketing

Parameter	Purpose
_bta_*	Bronto (Oracle Marketing) click tracking parameters

Mailchimp

Parameter	Purpose
mc_*	Mailchimp campaign tracking parameters (cid, eid)

Branch.io (deep linking)

Parameter	Purpose
_branch_match_id	NEW — Branch.io deep link matching identifier

Pinterest

Parameter	Purpose
epik	NEW — Pinterest conversion tracking tag identifier

Dotdigital

Parameter	Purpose
dm_i	NEW — Dotdigital (formerly dotmailer) email tracking identifier

Amazon Ads

Parameter	Purpose
mk*** (3-char suffix)	NEW — Amazon Marketing tag (e.g. mkt, mkrid)

Ceneo (Polish price comparison)

Parameter	Purpose
ceneo_cid	NEW — Ceneo click identifier, common for PL e-commerce

Strossle / SNRAI (native advertising)

Parameter	Purpose
snrai_*	NEW — Strossle / SNRAI native ad campaign tracking

Generic / Multi-platform

Parameter	Purpose
origin	General referral origin marker
ref	NEW — Generic referral source identifier
clickId	NEW — Generic affiliate/ad click identifier (used by multiple networks)
pcrid	NEW — Paid creative ID (used across multiple ad platforms)
trk_*	NEW — Generic tracking parameters (various marketing tools)
cm, cn, cs, si, tg	NEW — Short-form campaign tracking parameters (various tools)
sb_referer_host	NEW — SmartBanner referrer host parameter
redirect_mongo_id, redirect_log_mongo_id	NEW — Internal redirect tracking identifiers

Files Changed

• app/code/Magento/PageCache/etc/varnish4.vcl
• app/code/Magento/PageCache/etc/varnish5.vcl
• app/code/Magento/PageCache/etc/varnish6.vcl
• app/code/Magento/PageCache/etc/varnish7.vcl

⭐ Support my work

Do you like the fix? Remember to react with "" to get it merged faster, Then Sponsor me on Github so I can spend more time on fixing issues like this one.

Learn more at https://github.com/sponsors/lbajsarowicz