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- Feature: Added `--hub-hydration-target-config` option to specify the hydration target via a JSON config file (mutually exclusive with `--hub-hydration-target-spec`); supports `file` and `s3` types with structured settings
```json
{
"type": "file",
"settings": {
"path": "/path/to/hydration/storage"
}
}
```
```json
{
"type": "s3",
"settings": {
"uri": "s3://bucket[/prefix]",
"region": "us-east-1",
"endpoint": "http://localhost:9000",
"path-style": true
}
}
```
- Improvement: Hub hydration dehydration skips the `.sentry-native` directory
- Bugfix: Fixed `MakeSafeAbsolutePathInPlace` when a UNC prefix is present but path uses mixed delimiters
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Replace doctest SUBCASEs with sequential scoped blocks so the MinIO server is spawned once and torn down via RAII at scope exit, instead of being restarted for every subcase re-entry. Fixes flaky CI on macOS caused by repeated MinIO process start/stop.
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Adds a `SubprocessManager` for managing child processes with ASIO-integrated async exit detection, stdout/stderr pipe capture, and periodic metrics sampling. Also introduces `ProcessGroup` for OS-backed process grouping (Windows JobObjects / POSIX process groups).
### SubprocessManager
- Async process exit detection using platform-native mechanisms (Windows `object_handle`, Linux `pidfd_open`, macOS `kqueue EVFILT_PROC`) — no polling
- Stdout/stderr capture via async pipe readers with per-process or default callbacks
- Periodic round-robin metrics sampling (CPU, memory) across managed processes
- Spawn, adopt, remove, kill, and enumerate managed processes
### ProcessGroup
- OS-level process grouping: Windows JobObject (kill-on-close guarantee), POSIX `setpgid` (bulk signal delivery)
- Atomic group kill via `TerminateJobObject` (Windows) or `kill(-pgid, sig)` (POSIX)
- Per-group aggregate metrics and enumeration
### ProcessHandle improvements
- Added explicit constructors from `int` (pid) and `void*` (native handle)
- Added move constructor and move assignment operator
### ProcessMetricsTracker
- Cross-platform process metrics (CPU time, working set, page faults) via `QueryProcessMetrics()`
- ASIO timer-driven periodic sampling with configurable interval and batch size
- Aggregate metrics across tracked processes
### Other changes
- Fixed `zentest-appstub` writing a spurious `Versions` file to cwd on every invocation
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- Feature: Added S3 hydration backend for hub mode (`--hub-hydration-target-spec s3://<bucket>[/<prefix>]`)
- Credentials resolved from `AWS_ACCESS_KEY_ID`/`AWS_SECRET_ACCESS_KEY` env vars, falling back to EC2 instance profile via IMDS
- Each dehydration uploads to a new timestamped folder and commits a `current-state.json` pointer on success, so a failed upload never invalidates the previous state
- Hydration downloads to a temp directory first and only replaces the server state on full success; failures leave the existing state intact
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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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