Dotare upgraded their stake pool to Cardano node version 1.35.5, which was a maintenance release addressing a fix in ledger internal data structures.
As you may recall, Cardano network experienced a brief node outage that saw about 50% of network nodes inexplicably offline. However, the network recovered automatically in a few minutes without the need for an intervention.
For additional background on Cardano’s network resiliency, below are 2 deep dives from Charles Hoskinson on the matter.
Thoughts on the Cardano Network Stall
Prevention versus Recovery in Distributed Systems [Whiteboard]