[P-K Bridge] Relayer Development

[EmmanuellNorbertTulbure]

Goal

Plan

• Return actual weight from the receive_messages_delivery_proof call #2020 closed by Refund extra weight in receive_messages_delivery_proof call #2031
• Monitoring/alerts for Rococo/Wococo relaying #1715 implemented by Relay node down alert #2002
• Monitoring/alerts for Rococo/Wococo relaying #1715
• Avoid multiple reconnects of the same client during the single reconnect call #2444
• Monitoring/alerts for Rococo/Wococo relaying #1715 closed by Enable relayer rewards metrics at bridge hubs #1965 and RBH <> WBH dashboards and alerts #1966
• Kusama <> Polkadot relay prototype #1982
• Change instant payment reward scheme to reward relayer that submit confirmation transaction #597
• Only refund relayer if all bundled messages have been delivered/confirmed #2019
• Reject delivery transactions with at least one obsolete message #2021 improved by Impl review suggestions from #2021 #2036
• Boost message delivery transaction priority #2023
• Slash relayers for invalid transactions #2025

Optimizations & Fixes

• Don't start regular finality relay tasks from complex relayer if we use batch transactions #2071
• RialtoParachain <> Millau bridge is broken #2063 related to:
• submit lane unblock transactions from relay #2030
• Potentially fixed by Do not select any nonces in delivery race if something is already selected/submitted #2065
• Fixed by Fix the way latest_confirmed_nonce_at_source is "calculated" #2067
• Fix relayer code to submit empty message delivery transactions when the lane is blocked #2026
• helped by: Fix relayer code to submit empty message delivery transactions when the lane is blocked #2026
• closed by: submit lane unblock transactions from relay #2030
• Fix "delivery lags" alert #2005 closed by Fixed delivery alert rule #2052
• Alert that will fire if we are not running relayer #1999 closed by Relay node down alert #2002
• Invalid message delivery/confirmation proofs  #1955 closed by Fix invalid batch transaction #1957
• Remove all unused code from Backport xcm bridging extensions to the bridge repo PR #1946 closed by Remove deprecated code from bridge-runtime-common #1983
• Millau to Rialto relay broken #1932 closed by Fix invalid messages relay delivery transactions #1940
• Confirmation race stalls sometimes #1901 closed by Do not stall on lost transaction #1903
• Fix or remove XcmRouterWeigher from the bridge-runtime-common crate #1986 closed by Added receive_single_message_proof_with_dispatch benchmark #1990
• Fix or remove XcmRouterWeigher from the bridge-runtime-common crate #1986 closed by Added receive_single_message_proof_with_dispatch benchmark #1990
• Rococo <> Wococo bridge hub relay disconnects from our RBH node #1785 closed by Reconnect on-demand clients from MessagesSource::reconnect and MessagesTarget::reconnect #1927, Improve some relay errors readability #1930 and Actually clone client data by reference when cloning the client #1941
• Remove invalid weight, returned by send_message #1984
• MaxRequests -> MaxFreeMandatoryHeadersPerBlock in pallet-bridge-grandpa #1997 - Related to audit findings
• Fail with InsufficientDispatchWeight if dispatch_weight doesn't cover the weight of all bundled messages #2018
• Messages relay fixes #2073
• Add more logs to relayer and message pallets #2082
• Removed relayer_account: &AccountId from MessageDispatch  #2080

Deployment

Pre-release checklist