Until now, none of these profiling modes were available on the Beta Cluster.
As of today, the "Plaintext request profile" is supported on Beta Cluster.
This profile can be obtained by adding ?forceprofile=1 to any web request,
and making sure the X-Wikimedia-Debug header is set.
To make this easier to enable from a web browser, the WikimediaDebug
browser extension was updated (WikimediaDebug v1.9.1) to also send
X-Wikimedia-Debug headers on Beta Cluster requests. (For the time being,
the backend host names are ignored for Beta Cluster requests, this is a