The way we collect metrics for subscriptions doesn't permit us to sample and get the information we need to debug issues like e.g. https://discordapp.com/channels/407792526867693568/631379389111599114 (from Jan 6)

https://github.com/hasura/graphql-engine/blob/master/server/src-lib/Hasura/GraphQL/Execute/LiveQuery/Poll.hs#L210

Related: #3622