Yesterday f2pool announced they will be closing their Grin mining pool.
f2pool was previously Grin’s largest mining pool, with roughly 50% of network graphrate if I remember correctly. Since the announcement many miners have already migrated to goplinpool, which at the time of writing has 70% of network graphrate.
If this situation doesn’t get better it basically leaves the grin network at the mercy of goblinpool.
Thanks to @Cobragrin for bringing this up on keybase.
Update May 20, 2021: f2pool closed for good, goblin pool at 95% graphrate