We've confirmed that all systems are back to normal with no customer impact as of 2020/01/06, 05:23 UTC. Our logs show the incident started on 2019/12/19, 10:00 UTC and that during the 18 days 19 hours 37 minutes that it took to resolve the issue some of customers in Azure China East 2 Region experienced issue while accessing data through Logs Blade in the Azure Portal.
Root Cause: The failure was due to an issue with one of our dependent service.
Incident Timeline: 18 days 19 Hours & 37 minutes - 2019/12/19, 10:00 UTC through 2020/01/06, 05:23 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Initial Update: Monday, 06 January 2020 04:38 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers in Azure China may experience issue while accessing the data through the Logs blade.
Next Update: Before 01/06 09:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Monish