Hi,
I think it's a legitimate access call that needs to be allowed:
type=AVC msg=audit(1256842390.777:50774): avc: denied { read } for pid=17310 comm="httpd" name="status.dat" dev=dm-3 ino=182451 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:nagios_log_t:s0 tclass=file
Sincerely yours,
Vadym Chepkov