container audit
GTM-KD6TC9V
50 tags, 7 custom scripts, 0 third-party hosts — an ordinary container, near the middle of what we measure (median: 39 tags, 4 custom scripts).
- 7 custom HTML tags carrying 7 KB of JavaScript. This runs on every page the container loads on.
- Measurement runs through a server container on its own domain — the mark of a mature setup, and rarer than the tooling vendors imply.
Tags50
Custom scripts7
Third parties0
Delivered426 KB
Versions57
What we observed
A real browser loaded vauxhall.co.uk a month ago and recorded every request it made. This is what happened, as distinct from what the container is configured to do. It is one page load — anything that fires only deeper in the site did not fire here.
Container loaded from
googletagmanager.com — GoogleMeasurement sent to
opelvauxhall-g10-server-side-tagging-prod-406671236336.europe-west9.run.app — not GoogleMeasurement is first-party; the container still loads from Google. These are separate decisions, and this is the more common of the two.
Forwarded to
GA4 ×6 — read from the measurement id, not the hostname
Consent
a consent banner was present and we accepted it. Measurement fired beforehand but carried no identifier —
analytics_storage was denied, which is Consent Mode working as designed rather than a gap. 8 hosts appeared only after consent was granted. Google recorded gcs=G100 (all denied).Third parties contacted
25 hosts — rum.hlx.page, schema.milestoneinternet.com, ressource.gdpr-banner.awsmpsa.com, cdn-eu.dynamicyield.com, st-eu.dynamicyield.com, cdn-us-east.velaro.com, www.opel.de, api.gdpr-banner.awsmpsa.com, and 17 more
dataLayer events seen
gdprconsent, gtm.js, gtm.dom, gtm.load, gtm.click, gdprclosepopin, gtm.linkClick, gtm.timer
Where the data goes
Confirmed — a browser watched this site send measurement data to opelvauxhall-g10-server-side-tagging-prod-406671236336.europe-west9.run.app, not to Google. observed on vauxhall.co.uk More info »
Findings
Ordered by consequence. review has a concrete cost when it bites; info is real but depends on your setup. Seen is how common it is across the containers we have measured — reported separately on purpose, because common and harmless are different claims.
reviewWrites cookies directly (2)
2 pieces of custom code set cookies in code.
WhyCookies set this way bypass GTM's consent settings, because the consent checks live in the tag templates rather than in raw JavaScript.
CheckIf any of these cookies are used for analytics or advertising, confirm they are still gated on a consent decision.
Seenseen in 21.2% of 46,522 containers measured
infoUses browser storage (4)
4 pieces of custom code read or write localStorage or sessionStorage.
WhyBrowser storage persists across visits and is not covered by cookie consent tooling, so it is easy to overlook when auditing what you keep on a visitor's device.
CheckConfirm nothing personal is being kept there, and that it is covered by your privacy notice.
Seenseen in 23.3% of 46,522 containers measured
infoConsent configuration detected (1)
The container declares one or more consent signals.
WhyConsent handling is present in the container. This describes what the artifact declares; what actually happened on the page is measured separately, above.
CheckConfirm these settings match the consent policy you intend to enforce, and compare them with the before-and-after observation.
Seenseen in 44.6% of 46,522 containers measured
Third parties it can reach
Each host is a party that can execute code or receive data in a visitor's browser. Follow one to see who else loads it. More info »
No third-party hosts were found in this container's tags.
Detected on
Sites observed loading this container. A container used across many hosts is a shared template; one on a single host is a bespoke build. Follow a site to see every container it loads.
What this audit describes
Containers change. These findings describe one specific artifact, and you can re-fetch it to check this reading.
| Container | GTM-KD6TC9V |
|---|---|
| Published version | 57 — the identity of this configuration. It changes only when someone publishes. |
| Read at | 2026-08-23 17:37:19 UTC (a month ago) |
| Source | https://www.googletagmanager.com/gtm.js?id=GTM-KD6TC9V |
| Body checksum | b7d9aef1b97c49aacd91598d2da69f355ebe2227d1dff28aefddda7acc5406f9Evidence of the exact bytes we read, not an identity: Google varies the response per request, so re-fetching an unchanged container yields a different checksum. Compare the published version instead. |
Re-audit
This reading is from a month ago. A container can be republished at any time, and nothing here updates on its own — a fresh read is the only way to know whether it still says this. Running it again replaces this page in place, so the link keeps working.
Put this container under version control. Tagora exports it to a repository you own, so every change arrives as a pull request. How it works »