Group 1 - Bilibili (BILI.US) stock rose by 2.66% in pre-market trading, reaching a price of $27.00 [1] - The company has officially launched its "Double 11" promotional campaign, collaborating with Alibaba and JD.com for deeper data integration [1] - Bilibili's daily active users stand at 109 million, with an average usage time of 105 minutes [1] Group 2 - Approximately 70% of active users on Bilibili are from the post-90s and post-00s generations [1] - During the previous 6.18 shopping event, Bilibili achieved an average new customer entry rate of nearly 60% for the industry [1]

Incident Overview - The incident involving Bilibili was significant, lasting nearly four hours and affecting a wide range of services, leading to widespread discussion on social media platforms [3][19]. - The issues began around 5 PM and included homepage errors, video playback failures, and comment section unavailability, culminating in a complete service disruption [4][7][9][11]. Technical Analysis - The root cause of the incident was identified as a failure in the Service Discovery system, which is crucial for routing user requests to the appropriate servers [19][20]. - Approximately 10% of requests failed due to this issue, indicating that Bilibili had multiple instances of the Discovery service deployed, allowing some requests to still succeed [17][21]. - The 504 Gateway Timeout errors confirmed that while requests reached the gateway, the backend services were unresponsive, highlighting the dependency on the Discovery system [20][21]. Lessons Learned - The incident underscored the importance of infrastructure, particularly foundational services like Service Discovery, which, while invisible to users, can have a massive impact when they fail [26]. - The incident also demonstrated the necessity of high availability design, as the 5%-10% failure rate indicated effective disaster recovery mechanisms were in place [26]. - Monitoring and alerting systems proved valuable in quickly identifying the Discovery failure, showcasing the effectiveness of Bilibili's monitoring infrastructure [28].