It was stated that this also happens on 17.1.2, so the minor update might not be relevant here.
Setting `use_json=true` for oslo.log causes large memory consumption on RHOSP 17.1 enviroment

Workaround:
Do not use json logging format. `use_json=false`

-------------------------- original bug description --------------------------------
To Reproduce Steps to reproduce the behavior:

1. Perform a minor update to RHOSP 17.1.9
2. Wait for a while
3. The memory usage of neutron-server suddenly starts to increase linearly
4. The memory usage increases unlimitedly and cause OOM

Expected behavior

• neutron-server doesn't have memory leak

Bug impact

• High memory usage makes the controller node unstable, and finally it reaches to OOM

Known workaround

• Nothing