As you may be aware, on Friday there was an incident which lead to some missed slots. They issue has been resolved and all affected validators have been refunded.
Tx hash for refund tx is 0xc8811bb7d51d4bd66e51a6d88d23992f5a74fc2c8e8eff4641d26f8ac5b82149
Summary
On 28th of November, our relay experienced an incident that caused a high missed block rate due to a builder sending invalid blocks, which our relay processed optimistically. During this period, the simulator was under heavy load and became unresponsive. Requests to the simulator started to timeout, and the relay only demoted builders if the block validation failed, not if the simulation request timed out, so the blocks continued to be processed optimistically. Headers were served to validators for invalid blocks, leading to missed slots.
A full post mortem of the incident can be found on our gitub: “gattaca-com/helix/blob/main/incidents/post_mortem_28_nov.md”