Why the chatgpt was down for some time any reason?

Out of curiosity, what exactly happened during the recent ChatGPT outage? I noticed it was unavailable for a while and was wondering if there was a specific technical reason behind it. Was it caused by a server or infrastructure issue, a networking problem, a deployment that went wrong, an unexpected spike in traffic, or something else entirely? I’m interested in the engineering side of large-scale AI systems and would like to understand what failed, how the issue was identified, how it was mitigated, and what changes were made to prevent similar outages in the future. Any technical details or postmortem information would be appreciated.