Troubleshooting: Failing Heat api services

Had a failing Heat api services in the Cork controller node. Here is how I fixed this:

Make sure you have the api-paste.ini file in place:

[root@controller01 ~] ls /etc/heat/
api-paste.ini  environment.d  heat.conf  policy.json  templates

Also:

pip uninstall oslo.middleware
pip install oslo.middleware==3.8.0
pip install --upgrade osprofiler