All clients that relied on the mainnet Hiro API. This includes the Explorer, Stacks desktop and web wallets, the stacks CLI, and others. Requests on all endpoints to the mainnet API were still being served, but with a slower response time.
Some of our Stacks Blockchain API deployments running v6.2.1 are exhibiting out of memory (OOM) errors under certain situations. When an OOM occurs, traffic is diverted to other API deployments to serve traffic, but sometimes multiple deployments run out of memory at the same time, causing requests to hang for a noticeably longer time period.