I've tried to perform this request. When trying to check over there, repeat "session error, please try again" messages appeared. I logged-out, deleted cookies, and logged-in back several times without success. Other stewards were able to check, but not me. Filling as @Glaisher suggested to me on IRC#wikimedia-operations.
|mediawiki/core : wmf/1.27.0-wmf.14||CookieSessionProvider: It's persisted if we have a 'Token' cookie|
|mediawiki/core : master||CookieSessionProvider: It's persisted if we have a 'Token' cookie|
|mediawiki/extensions/CentralAuth : wmf/1.27.0-wmf.13||CentralAuth sessions should always be persistent|
|mediawiki/extensions/CentralAuth : wmf/1.27.0-wmf.14||CentralAuth sessions should always be persistent|
|mediawiki/extensions/CentralAuth : master||CentralAuth sessions should always be persistent|
|Resolved||Deskana||T75616 Tracking: API/backend issues blocking Wikipedia app development|
|Resolved||Anomie||T32788 Allow triggering of user password reset email via the API|
|Open||None||T90925 General authentication improvements for MediaWiki|
|Resolved||Anomie||T48179 Allow a challenge stage during authentication|
|Open||None||T5709 Refactoring to make external authentication and identity systems easier|
|Resolved||Tgr||T43201 UserLoadFromSession considered evil|
|Resolved||Anomie||T67493 Session is started by EditAction (problem for extensions using UserLoadFromSession hook)|
|Open||None||T55156 Provide option to force a login session to end within a certain time|
|Open||None||T89459 Modernize MediaWiki authentication system (AuthManager)|
|Resolved||Anomie||T123451 Deploy SessionManager and bot passwords|
|Resolved||Tgr||T125313 Session error message when trying to execute sysop/CU/OS actions|
I can confirm that this happen, but not only at CU actions. I get this at test2 and beta-cluster, without logout and login again I can't delete pages or block users. The problem: Sometimes logout and login again did not help.
Neither do I. Nor for Luke081515 on test2wiki, all I see for him is one successful login.
We'll probably have to find a time when this is happening that I'm on IRC for some live debugging. For preparation, if you (@MarcoAurelio and/or @Luke081515) could figure out how to capture the HTTP request and response headers in your browser of choice that would likely be helpful, and if you're using Firefox or Chrome you might also install the Wikimedia Debug Firefox or Chrome browser extension.
I don't have access to logstash so I can't comment on that. What I got is a session error message when trying to perform the action, repeatedly. If this ever happens again and any of you are around on IRC, I can try to contact you.
Maybe useful? - From console:
load.php?debug=false&lang=es&modules=jquery%2Cmediawiki&only=scripts&skin=monobook&version=vWmIJl0K:156 Use of "addOnloadHook" is deprecated. Use jQuery instead. load.php?debug=false&lang=es&modules=jquery%2Cmediawiki&only=scripts&skin=monobook&version=vWmIJl0K:156 Use of "addOnloadHook" is deprecated. Use jQuery instead.
I don't think this is causing the issue though.