ECS will call a deploy successful before it finishes. Decide what your pipeline should believe.

Amazon ECS Early Success Criteria lets you declare a rolling deployment successful at a task percentage you choose. The same percentage is where the circuit breaker stops protecting you, which makes it a harder number to pick than it looks.
EKS opened up the scheduler. MostAllocated is the one with a bill attached.

Amazon EKS now lets you set four control plane parameters directly, including the scheduler scoring strategy. Switching from LeastAllocated to MostAllocated packs pods onto fewer nodes and cuts compute spend. The payloads, the resource weights, and the trade-offs that are hard to undo.