I haven't got any email or error or any issue. And I have check my logs/upgrade_modules.log nothing found useful.

This is log - 

####@#####:~/htdocs/logs$ cat upgrade_modules.log

03-16 02:30:07:

Cannot get a list of modules which require to be updated.

03-17 02:30:07:

Cannot get a list of modules which require to be updated.

03-18 02:30:07:

Cannot get a list of modules which require to be updated.

03-19 02:30:04:

Cannot get a list of modules which require to be updated.

03-20 02:30:07:

Cannot get a list of modules which require to be updated.

03-21 02:30:06:

Cannot get a list of modules which require to be updated.

03-22 02:30:05:

Cannot get a list of modules which require to be updated.