Nodle Arcadia finalization stalling at 140798

[emielsebastiaan]

Describe the bug
Finalization is stalling on Nodle Arcadia network at block 140798.
This could be related to Grandpa finality or changes to the validator set.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Telemetry: https://telemetry.polkadot.io/#list/Arcadia%20Nodle%20Network'
2. Add column 'Finalized Block'
3. See error

Expected behavior
The finalized block should be only a limited number of blocks behind chaintip under normal network conditions.

Current behavior
Finalization is stalled at 3 April 2018 at block 140798
Polkascan: https://polkascan.io/pre/nodle-arcadia/block/140798

System (please complete the following information):

• N/A this is related to the blockchain network itself.

[ETeissonniere]

Seems like we are having an authority set issue, we could have hard forked the network to fix this but sadly we don't have access to the code to do so as we are on alpha.3. All things taken in consideration it seems like a good opportunity to restart the network to alpha.5 in order to keep track with the changes on parity's side.

I am currently finishing the deployment on our side, would it be possible to restart the ingestion process on your side once it is done?

[ETeissonniere]

Seems like things are running fine on the new network (that actually runs alpha.6)