logrotate script does not reload logs

What happened?

The logrotate script installed by sudo pm2 logrotate -u <user> per http://pm2.keymetrics.io/docs/usage/log-management/#setting-up-a-native-logrotate will create log files that are not written to (they stay at 0 bytes).

What did you expect to happen?

I expect that log files created by logrotate can be written to by pm2.

Environment info

Operating System: Ubuntu 14.04.4
Pm2 version: 1.1.3
Node version: 0.10.45
Shell: bash

Steps to reproduce

1. sudo pm2 logrotate -u <user>
2. sudo logrotate -f /etc/logrotate.d/pm2-<user>
3. ls -la ~/.pm2/logs
4. Observe that the new log files stay at 0 bytes in size.
5. pm2 reloadLogs
6. ls -la ~/.pm2/logs
7. Observe that the new log files are now logged to.

What have you tried?

1. The solution by @sominlee74 in https://github.com/Unitech/pm2/issues/1469#issuecomment-215672049 fixed the issue entirely.

I believe that the logrotate script that gets generated just needs to have a couple more things added to it. Adding su <user> <user> and

postrotate
    su -c "pm2 reloadLogs" - <user>
endscript

fixed the issue.

Inspect the implementation behind sudo pm2 logrotate -u <user> and the generated /etc/logrotate.d/pm2-<user> script. Reproduce the issue with sudo logrotate -f, then verify that rotated logs receive new output without running pm2 reloadLogs.