shell-file-name is a variable defined in ‘C source code’.
Its value is "/usr/local/bin/zsh"
Original value was "/bin/bash"
Local in buffer rebar.config; global value is "/bin/zsh"

connection-local-criteria-alist is a variable defined in ‘files-x.el’.
Its value is
(((:application tramp :protocol "adb")
  tramp-adb-connection-local-default-profile)
 ((:application tramp :machine "remotemachine")
  remote-zsh)
 ((:application tramp)
  tramp-connection-local-default-profile))

(funcall
 (pcase-lambda ((app iso8601-parse (seq _ M H)))
   (format "%02d:%02d" H M))
 "2021-10-24T11:44:38.037896952+02:00")