Deprecation should be interpreted as a fair warning that the version will soon be turned off. Developers will actively be encouraged to upgrade their code at that point. Sunset means that the version is no longer available.
The current schedule is deprecation / sunset takes effect on the last weekday of:
|v201905||February 2020||May 2020|
|v201902||November 2019||February 2020|
|v201811||August 2019||November 2019|
|v201808||Currently Deprecated||August 2019|