-You'll see blocklisting kick in often during development: some bug causes your service host to crash on startup. Service Fabric tries to create the service host a few times, and the failure keeps occurring. After a few attempts, the node gets blocklisted, and the Cluster Resource Manager will try to create the service elsewhere. If that failure keeps happening on multiple nodes, it's possible that all of the valid nodes in the cluster end up blocked. Blocklisting cna also remove so many nodes that not enough can successfully launch the service to meet the desired scale. You'll typically see additional errors or warnings from the Cluster Resource Manager indicating that the service is below the desired replica or instance count, as well as health messages indicating what the failure is that's leading to the blocklisting in the first place.
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