Back in November 2020, I announced the introduction of the changelog on qlik.dev along with the end to updates for the API Insights application for exploring API changes in client-managed editions of Qlik Sense.
Today, January 29th, 2021 marks the end of life for the API Insights website the application was hosted. You may continue to use the files with API changes through Qlik Sense Client-Managed September 2020 by downloading them from here and importing them to your own client-managed instance.
As it was detailed in the November blog post, the qlik.dev changelog is where you can find information related to changes in Qlik Cloud Services platform APIs and tools.
For more information about Qlik APIs and Qlik's API Governance policy, please visit qlik.dev.