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Alexey Artamonov
e63b9e439c
The limiter refuses for good any request it counts above burst, and burst was the receiver's 4 MiB cap. A request grows on its way to the limiter: the sampler adds a tracestate to every span it keeps, and the limiter counts a request as the collector re-encodes it, which writes the empty value of every attribute the wire may omit, so a valid request of spans with empty-valued attributes is counted 1.4x. A request the receiver admitted near its cap was therefore refused on every retry. The limiter now runs right after memory_limiter, so it counts the request before sampling. The receiver caps a request at 3 MiB and burst stays at 5 MiB, which holds 1.4x the cap; a larger burst would also be what each pod start lets through above the rate. The rate is counted before sampling, so the store keeps only the sampled share of it. The texts say that a request above the cap gets a 400, which senders do not retry, and that each collector rollout a tenant causes lets that burst through again on every pod. The replica bound that keeps that allowance small now applies only to a central tenant's collector, whose render fails above ten replicas: a collector writing to the tenant's own store has no rate, and the replica counts it shipped with stay valid. Signed-off-by: Alexey Artamonov <aleksei.artamonov@aenix.io>