When I saw "secret store" I guessed it had to be Vault. Vault's is amazing but it lets you configure things that can blow up on you in X time. For example, issuing 50 secrets per second but have every secret expire after a week (or never). It would mean (multiple) goroutine per secret checking status on the lease. This kind of thing unfortunately, is easy to miss and occur in Vault.

The person mentioning secret store, and the blog post they put up does seem to somewhat point to Vault, but no name drop.

> A core system in our infrastructure became overwhelmed, prompted by a subtle bug in our backend service communications while under heavy load. This was not due to any peak in external traffic or any particular experience. Rather the failure was caused by the growth in the number of servers in our datacenters. The result was that most services at Roblox were unable to effectively communicate and deploy.

https://blog.roblox.com/2021/10/update-on-our-outage/