On March 11th, GitHub experienced a two-hour disruption due to a sophisticated distributed denial of service (DDoS) attack, which impacted accessibility to the platform. The attack, which primarily targeted the load balancing tier, involved a large number of HTTP requests directed at a crafted URL that consumed significant network resources. GitHub's mitigation strategies involve handling both volumetric and complex attacks, and while they successfully mitigated this attack, it exposed gaps in their monitoring and pre-configuration capabilities. The company has since implemented improvements in their monitoring systems, enhanced their automatic mitigation capabilities, and is exploring ways to simulate attacks to bolster response times. The incident underscores GitHub's commitment to reinforcing its infrastructure to maintain reliability and trust among its users.