This is, in fact, documented. See:
http://manpages.ubuntu.com/manpages/maverick/en/man8/cron.8.html
Quoting (2nd paragraph):
Additionally, cron reads the files in /etc/cron.d [...] Files must conform to
the same naming convention as used by run-parts(8): they must consist solely
of upper- and lower-case letters, digits, underscores, and hyphens. [...]
** Changed in: cron (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/706565
Title:
configs with dots in file name not working in /etc/cron.d
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