Maptiler retaining Renderer after each process.

[Wolfie432]

I created a service which creates raster-tiles in png format using maptiler. I am using a maptiler in docker container. So after each process I restart the process inside the container by giving SIGHUP signal when style.json is changed. I mean I change style.json and give SIGHUP signal. So I run a process which creates some PNG's, then I have RAM be X Gb, so now I change style.json and give SIGHUP signal, the container retains the RAM. Generally when process exits, it should clear all the Garbage that is collected.
Possible cause it retains the renderers. So how to clear the renderers ( I can see renderer.release but y renderers are retained).