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- Improvement: Hub shares a single S3 client and IMDS credential provider across all modules, reducing IMDS load and surviving transient IMDS blips during bulk provisioning
- Improvement: Hub validates hydration config at startup; bad `--hub-hydration-target-spec` or `--hub-hydration-target-config` now fails `zen hub` at boot instead of per-module at first hydrate
- Improvement: S3 hydration multipart chunk size configurable via `settings.chunk-size` (default 32 MiB)
- Improvement: S3 client extracts `<Error><Code>` and `<Message>` from XML error bodies (previously logged as `<unhandled content format>`)
- Improvement: S3 client fails fast with a "no credentials available" error when AWS credentials are missing, instead of sending an unsigned request that S3 rejects with a generic 400
- Improvement: IMDS credential provider retries transient connection failures (up to 3 attempts with backoff)
- Improvement: HTTP clients with `RetryCount > 0` also retry on `CURLE_COULDNT_CONNECT`
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* scrub sensitive command line options from log and sentry
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* fix endpoint for stats/hub in compute/hub.html page
* fix api token call failure for imds (using wrong overload for Put)
* add "localhost" to healt check url in consul when no address is given
* add consul fallback deregister if normal deregister fails
* add consul registration unit test
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This functionality is intended to be used to manage datasets for test cases, but may be useful elsewhere in the future.
- **Add S3 client with AWS Signature V4 (SigV4) signing** — new `S3Client` in `zenutil/cloud/` supporting `GetObject`, `PutObject`, `DeleteObject`, `HeadObject`, and `ListObjects` operations
- **Add EC2 IMDS credential provider** — automatically fetches and refreshes temporary AWS credentials from the EC2 Instance Metadata Service (IMDSv2) for use by the S3 client
- **Add SigV4 signing library** — standalone implementation of AWS Signature Version 4 request signing (headers and query-string presigning)
- **Add path-style addressing support** — enables compatibility with S3-compatible stores like MinIO (in addition to virtual-hosted style)
- **Add S3 integration tests** — includes a `MinioProcess` test helper that spins up a local MinIO server, plus integration tests exercising the S3 client end-to-end
- **Add S3-backed `HttpObjectStoreService` tests** — integration tests verifying the zenserver object store works against an S3 backend
- **Refactor mock IMDS into `zenutil/cloud/`** — moved and generalized the mock IMDS server from `zencompute` so it can be reused by both compute and S3 credential tests
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