Resolves https://github.com/spring-cloud/spring-cloud-stream/issues/2485
These improvements are threading related
Initial implementation
Readd missing 'cache' for recent offset lags and general refactoring
Add a test case for the schedule-only variant and externalize scheduling interval
Consistency of configuration property naming and minor cleanup of existing code
Review feedback: documentation, author addition and copyright adjustments
Doc wording changes
Fix checkstyle issues
Adjust reference doc and improve new property names according to review
Move documentation to the correct file
de0efcf0a1