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Josh Siviour
bef0780b10
* fix(ecs): make awsvpc ENI slots a placement resource A container instance carries a finite number of awsvpc task ENIs — the hot-plug PCIe root ports the daemon pre-allocates from the instance type's cap — and nothing outside the daemon knew the limit existed. The scheduler's capacity model was CPU, memory and GPU, so every over-capacity task was placed, created an ENI, failed to hot-plug it and rolled it back. A service asking for more tasks than the cluster has slots churned ENI create/delete indefinitely instead of reporting a placement failure once. On a t3.micro the third task and everything after it failed with "attach task ENI eni-… -> i-…: ServerInternal". The instance record now carries the instance type, reported the way AWS carries it, as the ecs.instance-type container-instance attribute; the ENI cap is derived from it rather than stored, so a corrected limit table applies on the next read. An instance whose type has not been reported is not gated at all: a recognised type always has at least one slot, so zero can only mean unknown, and refusing every awsvpc placement against an older agent would turn a mixed-version cluster into an outage. Both placement paths gate on it. A task declined for want of an interface is reported as RESOURCE:ENI, spelled as AWS spells it, and separately from a plain capacity refusal. The caller-visible detail is a fixed sentence; the wrapped error keeps its identifiers and server error codes in the log, where someone can act on them. DescribeInstanceTypes now reports NetworkInfo.MaximumNetworkInterfaces, from the same table the slot allocator enforces, so a caller sizing an autoscaling group has something to size against. Fields this stack does not implement are left unset rather than guessed. Finally, the daemon records the slot it actually allocated as the ENI's device index. The requested index was stored verbatim, so every task ENI on an instance reported index 1 while landing on a different PCIe slot; on AWS a device index is unique per instance. * fix(ecs): send an ENI capacity refusal as the reason alone AWS returns RESOURCE:* placement failures with no detail. Carrying a sentence there gives a caller a second string to parse that says nothing the reason does not already say.