Document log handling behavior

[christophermaier]

From @imbriaco on January 13, 2016 19:21

Need to fully document TolerantFile behavior:

• Describe file lifecycle and stat() calls
• Explain behavior when log file is moved
• Describe recommended approach for log rotation (ie: just move the file, cog will make a new one)

Copied from original issue: operable/cog#38

[christophermaier]

From @vanstee on October 14, 2016 18:12

I'm not sure we're still using the TolerantFile module in our codebase anymore.

[christophermaier]

We do; it's in probe: https://github.com/operable/probe/blob/master/lib/probe/tolerant_file.ex

[christophermaier]

From @vanstee on October 14, 2016 18:16

D'oh thanks @christophermaier.