Just to offer a negative data point: we're doing something similar to your use case at $work, that is, we rely on inotify to postprocess call recordings that were finished by Asterisk, monitoring IN_CLOSE_WRITE events, just like you, and to my knowledge we've never seen such random delays in receiving events during the 3+ years this system has been in production. However, in our case the user side inotify implementation is in Go.

What kernel version do you use? That may be relevant.

In reply to Re^3: Fresh eyes - linux::Inotify2 event delays by kikuchiyo
in thread Fresh eyes - linux::Inotify2 event delays by ghenry

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