Nothing, if you are just visiting
The public landing page sets no cookies, loads no fonts, scripts, images or
assets from anyone else's servers, and runs no analytics, tag manager, pixel or
session-recording tool of any kind. There is nothing on it that reports your
visit to a third party, because there is no third party.
One cookie, only if you sign in
Signing in sets a single session cookie so the gate knows you are signed in
as you move between applications. It is scoped to this domain, it is not shared
with anyone, it is not used to profile you, and signing out removes it.
Accounts
An account exists because someone here created it for you. It holds your
username and the password you were issued or set. Actions you take inside the
applications — signing a step, acknowledging an alarm, leaving feedback — are
recorded against your name, because that is the entire point of a system built
for regulated manufacturing.
Server logs
The web server keeps operational logs: certificate renewals, start-ups, and
errors. An error entry can include the address you requested and the IP address
it came from. There is no per-request access log — ordinary successful page
views are not recorded.