using fluent-logger-python with eventlet

Hello,

I saw a surprising memory usage growth (see this [issue](https://github.com/eventlet/eventlet/issues/741)). But when I remove `monkey_patch` looks like memory usage back to normal. Does fluent-logger-python compatible with eventlet?

The issue names no source file or test. Start by reproducing the memory-growth report with eventlet, comparing behavior with and without monkey_patch, and review the linked eventlet issue; done requires a documented compatibility diagnosis and a concrete project change or explicit conclusion.

索引モデルが issue の本文から書いたものです。