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- **Eliminate `<regex>` usage** — Replaced `std::regex`-based URL parsing in `jupiterbuildstorage.cpp` with manual `string_view` parsing. Added `CXXOPTS_NO_REGEX` to disable regex in cxxopts. Includes comprehensive tests for the new URL parser.
- **Add missing HTTP response codes** — Added `102`, `103`, `203`, `207`, `208`, `226`, `306`, `421`, `425`, `451` to the enum and reason string lookup.
- **Add `ForceColor` support to zen CLI** — Plumbed the `ForceColor` logging option through to the zen client.
- **Add `.clangd` config** — Strips MSVC-specific flags clangd can't handle and suppresses noisy clang-tidy checks.
- **Generic `fmt::formatter` for `ToString`** — Concept-based formatter that auto-formats any type with a free `ToString()` function, removing the need for per-type specializations.
- **Fix OpenSSL dependency** — Changed `zenhorde` to use `openssl3` package on Linux/macOS.
- **Add `<cmath>` include** — Missing include in `hyperloglog.h`.
- **GCC compile fix** — Moved `static constinit` variable inside lambda in `logging.cpp`.
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## Summary
Adds probabilistic cardinality estimation for tracking unique HTTP clients and sessions using a HyperLogLog implementation.
- Add a `HyperLogLog<Precision>` template in `zentelemetry` with thread-safe lock-free register updates, merge support, and XXH3 hashing
- Feed client IP addresses (via raw bytes) and session IDs (via `Oid` bytes) into their respective HyperLogLog estimators from both the ASIO and http.sys server backends
- Emit `distinct_clients` and `distinct_sessions` cardinality estimates in HTTP `CollectStats()`
- Add tests covering empty, single, duplicates, accuracy, merge, and clear scenarios
## Why HyperLogLog
Tracking exact unique counts would require storing every observed IP or session ID. HyperLogLog provides a memory-bounded probabilistic estimate (~1–2% error) using only a few KB of memory regardless of traffic volume.
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- **Frontend dashboard overhaul**: Unified compute/main dashboards into a single shared UI. Added new pages for cache, projects, metrics, sessions, info (build/runtime config, system stats). Added live-update via WebSockets with pause control, sortable detail tables, themed styling. Refactored compute/hub/orchestrator pages into modular JS.
- **HTTP server fixes and stats**: Fixed http.sys local-only fallback when default port is in use, implemented root endpoint redirect for http.sys, fixed Linux/Mac port reuse. Added /stats endpoint exposing HTTP server metrics (bytes transferred, request rates). Added WebSocket stats tracking.
- **OTEL/diagnostics hardening**: Improved OTLP HTTP exporter with better error handling and resilience. Extended diagnostics services configuration.
- **Session management**: Added new sessions service with HTTP endpoints for registering, updating, querying, and removing sessions. Includes session log file support. This is still WIP.
- **CLI subcommand support**: Added support for commands with subcommands in the zen CLI tool, with improved command dispatch.
- **Misc**: Exposed CPU usage/hostname to frontend, fixed JS compact binary float32/float64 decoding, limited projects displayed on front page to 25 sorted by last access, added vscode:// link support.
Also contains some fixes from TSAN analysis.
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Removes the vendored spdlog library (~12,000 lines) and replaces it with a purpose-built logging system in zencore (~1,800 lines). The new implementation provides the same functionality with fewer abstractions, no shared_ptr overhead, and full control over the logging pipeline.
### What changed
**New logging core in zencore/logging/:**
- LogMessage, Formatter, Sink, Logger, Registry - core abstractions matching spdlog's model but simplified
- AnsiColorStdoutSink - ANSI color console output (replaces spdlog stdout_color_sink)
- MsvcSink - OutputDebugString on Windows (replaces spdlog msvc_sink)
- AsyncSink - async logging via BlockingQueue worker thread (replaces spdlog async_logger)
- NullSink, MessageOnlyFormatter - utility types
- Thread-safe timestamp caching in formatters using RwLock
**Moved to zenutil/logging/:**
- FullFormatter - full log formatting with timestamp, logger name, level, source location, multiline alignment
- JsonFormatter - structured JSON log output
- RotatingFileSink - rotating file sink with atomic size tracking
**API changes:**
- Log levels are now an enum (LogLevel) instead of int, eliminating the zen::logging::level namespace
- LoggerRef no longer wraps shared_ptr - it holds a raw pointer with the registry owning lifetime
- Logger error handler is wired through Registry and propagated to all loggers on registration
- Logger::Log() now populates ThreadId on every message
**Cleanup:**
- Deleted thirdparty/spdlog/ entirely (110+ files)
- Deleted full_test_formatter (was ~80% duplicate of FullFormatter)
- Renamed snake_case classes to PascalCase (full_formatter -> FullFormatter, json_formatter -> JsonFormatter, sentry_sink -> SentrySink)
- Removed spdlog from xmake dependency graph
### Build / test impact
- zencore no longer depends on spdlog
- zenutil and zenvfs xmake.lua updated to drop spdlog dep
- zentelemetry xmake.lua updated to drop spdlog dep
- All existing tests pass, no test changes required beyond formatter class renames
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* added TEST_SUITE_BEGIN/END around some TEST_CASEs which didn't have them
* fixed some stats issues
* ScopedSpan should Initialize
* annotated classes in stats.h with some documentation comments
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Makes all test cases part of a test suite. Test suites are named after the module and the name of the file containing the implementation of the test.
* This allows for better and more predictable filtering of which test cases to run which should also be able to reduce the time CI spends in tests since it can filter on the tests for that particular module.
Also improves `xmake test` behaviour:
* instead of an explicit list of projects just enumerate the test projects which are available based on build system state
* also introduces logic to avoid running `xmake config` unnecessarily which would invalidate the existing build and do lots of unnecessary work since dependencies were invalidated by the updated config
* also invokes build only for the chosen test targets
As a bonus, also adds `xmake sln --open` which allows opening IDE after generation of solution/xmake project is done.
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This PR brings over some changes made to avoid performing setup for otel instrumentation if we are not sending otel information anywhere anyway.
It also adds the ability to configure an OTLP endpoint on the command line using `--otlp-endpoint=<URI>`.
Bear in mind that OTLP support is still not officially supported so this should not be used in production at this stage.
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this change adds OTEL tracing to a few places
* Top-level application lifecycle (config/init/cleanup, main loop)
* http.sys requests
it also brings some otlptrace optimizations and dynamic configuration of tracing. OTLP tracing is currently always disabled
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This change removes our dependency on vcpkg for package management, in favour of bringing some code in-tree in the `thirdparty` folder as well as using the xmake build-in package management feature. For the latter, all the package definitions are maintained in the zen repo itself, in the `repo` folder.
It should now also be easier to build the project as it will no longer depend on having the right version of vcpkg installed, which has been a common problem for new people coming in to the codebase. Now you should only need xmake to build.
* Bumps xmake requirement on github runners to 2.9.9 to resolve an issue where xmake on Windows invokes cmake with `v144` toolchain which does not exist
* BLAKE3 is now in-tree at `thirdparty/blake3`
* cpr is now in-tree at `thirdparty/cpr`
* cxxopts is now in-tree at `thirdparty/cxxopts`
* fmt is now in-tree at `thirdparty/fmt`
* robin-map is now in-tree at `thirdparty/robin-map`
* ryml is now in-tree at `thirdparty/ryml`
* sol2 is now in-tree at `thirdparty/sol2`
* spdlog is now in-tree at `thirdparty/spdlog`
* utfcpp is now in-tree at `thirdparty/utfcpp`
* xmake package repo definitions is in `repo`
* implemented support for sanitizers. ASAN is supported on windows, TSAN, UBSAN, MSAN etc are supported on Linux/MacOS though I have not yet tested it extensively on MacOS
* the zencore encryption implementation also now supports using mbedTLS which is used on MacOS, though for now we still use openssl on Linux
* crashpad
* bumps libcurl to 8.11.0 (from 8.8.0) which should address a rare build upload bug
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move spdlog into the tree to remove dependency on vcpkg::spdlog, to allow diverging from the official version and evolve it to fit better with OTLP logging requirements
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- adds `zentelemetry` project which houses new functionality for serializing logs and traces in OpenTelemetry Protocol format (OTLP)
- moved existing stats functionality from `zencore` to `zentelemetry`
- adds `TRefCounted<T>` for vtable-less refcounting
- adds `MemoryArena` class which allows for linear allocation of memory from chunks
- adds `protozero` which is used to encode OTLP protobuf messages
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