Warning: Multiple definition of ad_acs_kernel_id in /web/service/packages/acs-tcl/tcl/request-processor-procs.tcl and /web/service/packages/acs-tcl/tcl/20-memoize-init.tcl
It is innocuous, and the warning will no longer be displayed
in 5.1 (the function is redefined on it's first call to hardcode the return of the id rather than be memoized which is why you were seeing the warning).