[Invoker] Check the file system disk space usage to avoid that invokers run out of space (cont.)

[steffenrost]

Check the file system disk space usage to avoid that invokers run out of space. Make the max threshold values for root and logs filesystem configurable.

Description

Invoker pods may run out of space on their root and log volumes for very frequent scheduled actions producing a high load of log messages or because of many docker images which are not cleaned up. By this code change this situation is taken into consideration and the affected invoker will be temporary evacuated until the situation has been resolved. By this code change the file system occupation is checked every minute. Also the logic to do hysteresis has been removed as it interferes with the image monitor.

My changes affect the following components

• API
• Controller
• Message Bus (e.g., Kafka)
• Loadbalancer
• Invoker
• Intrinsic actions (e.g., sequences, conductors)
• Data stores (e.g., CouchDB)
• Tests
• Deployment
• CLI
• General tooling
• Documentation

Types of changes

• Bug fix (generally a non-breaking change which closes an issue).
• Enhancement or new feature (adds new functionality).
• Breaking change (a bug fix or enhancement which changes existing behavior).

Checklist:

• I signed an Apache CLA.
• I reviewed the style guides and followed the recommendations (Travis CI will check :).
• I added tests to cover my changes.
• My changes require further changes to the documentation.
• I updated the documentation where necessary.

[falkzoll]

Looks fine to me 👍 .