* improve code for metrics
* improve code for metrics
* fix
* fix
* Refactor telemetry initialization and environment functions ordering
- Reorder functions in envs.rs by type size (8-bit to 64-bit, signed before unsigned) and add missing variants like get_env_opt_u16.
- Optimize init_telemetry to support three modes: stdout logging (default error level with span tracing), file rolling logs (size-based with retention), and HTTP-based observability with sub-endpoints (trace, metric, log) falling back to unified endpoint.
- Fix stdout logging issue by retaining WorkerGuard in OtelGuard to prevent premature release of async writer threads.
- Enhance observability mode with HTTP protocol, compression, and proper resource management.
- Update OtelGuard to include tracing_guard for stdout and flexi_logger_handles for file logging.
- Improve error handling and configuration extraction in OtelConfig.
* fix
* up
* fix
* fix
* improve code for obs
* fix
* fix
This commit introduces two key enhancements: the integration of Grafana Tempo for distributed tracing and the implementation of a dual-stack TCP listener for improved network compatibility.
- **Observability**:
- Adds the `tempo` service to the `docker-compose.yml` observability stack.
- Tempo is configured to collect and store traces, integrating with the existing OpenTelemetry setup.
- A custom `tempo-entrypoint.sh` script is included to manage volume permissions on startup.
- **Networking**:
- Modifies `http.rs` to support dual-stack (IPv4/IPv6) connections on a single socket.
- By setting the `IPV6_V6ONLY` socket option to `false`, the server can now accept both IPv6 and IPv4-mapped IPv6 traffic, enhancing cross-platform support.
* chore: Add copyright and license headers
This commit adds the Apache 2.0 license and a copyright notice to the header of all source files. This ensures that the licensing and copyright information is clearly stated within the codebase.
* cargo fmt
* fix
* fmt
* fix clippy
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