CHW-4838 DockerUploadCapacity

Client Input Updated

too many docker blob uploads in progress (16 per client, 2 GiB in all); retry after the interval in Retry-After

Default message: too many docker blob uploads in progress (16 per client, 2 GiB in all); retry after the interval in Retry-After
HTTP status: 429 (client)
Reason: RATE_LIMITED

Problem. A Docker push was refused with 429. Cause. Blob uploads are held in memory until they complete, so they are bounded: one client may have at most 16 uploads open, and the proxy holds at most 2 GiB of upload data at a time. This push would have passed one of those limits. Fix. Retry; Docker backs off on 429 and retries on its own. If it persists, push fewer images in parallel from the same client. HTTP 429, with Retry-After.