Multiple Services: Partially incomplete log data due to monitoring agent issue

This incident review outlines a bug that occurred in one of Microsoft's internal monitoring agents, resulting in incomplete log data for some of the affected services. The issue did not impact the uptime of any customer-facing services or resources, but it did affect the collection of log events. The bug was detected on 5 September, and after investigation, a temporary workaround was implemented to reduce the impact of these failures. However, some customers may have experienced occasional increased latency or delays in log delivery due to this workaround. The engineering team continued to investigate the cause of the issue while exploring multiple paths toward mitigation for the affected agents. A subset of Microsoft cloud services had partially incomplete log data during the impact period. Customers who use a service affected by this issue were contacted through the Microsoft 365 Message Center and/or Azure Service Health for information. More information on how Microsoft is making incidents like this less likely or less impactful can be found on the post linked below.

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