The runtime 1091 is a minor upgrade to add back the missing storage migration for Council, TechnicalCommittee, Tips, and Bounties. To lean more about the storage migration, please check Phala-Network/phala-blockchain#612.
It also includes a minor typo fix in the pallet: Phala-Network/phala-blockchain@d782e8d
Upgrade instructions
This upgrade only contains an on-chain runtime upgrade. No new client is released. Existing downstream consumers including pherry and PRB, and all the clients relying on the recent version of polkadot.js can automatically handle the upgrade. It's suggested to keep monitoring the nodes to make sure they will operate normally.
However if you are one of the following roles, you should follow the instructions:
For transaction signers: If you sign transactions with any 3rd party Substrate client which cannot deal with the runtime upgrade (i.e. subxt, GSRPC), you will need to restart or reload the client after the runtime upgrade applies. Otherwise you may get invalid signatures. Polkadot.js based clients should be able to automatically pick up the new metadata.
For index services: Please carefully examine the indexer after the runtime upgrade to make sure it operates properly. This upgrade introduces a typo fix of PhalaMining.ExitUnresponsive. The indexer may be disturbed by the renaming.