hmon: add heartbeat monitor

[arkjedrz]

Add heartbeat monitor HMON.

Resolves #68

[github-actions]

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[License Check Output]
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WARNING: For repository 'score_rust_policies', the root module requires module version score_rust_policies@0.0.3, but got score_rust_policies@0.0.5 in the resolved dependency graph. Please update the version in your MODULE.bazel or set --check_direct_dependencies=off
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INFO: Elapsed time: 32.019s, Critical Path: 2.44s
INFO: 16 processes: 12 internal, 3 processwrapper-sandbox, 1 worker.
INFO: Build completed successfully, 16 total actions
INFO: Running command line: bazel-bin/license.check.license_check ./formatted.txt <args omitted>
usage: org.eclipse.dash.licenses.cli.Main [-batch <int>] [-cd <url>]
       [-confidence <int>] [-ef <url>] [-excludeSources <sources>] [-help] [-lic
       <url>] [-project <shortname>] [-repo <url>] [-review] [-summary <file>]
       [-timeout <seconds>] [-token <token>]

[github-actions]

The created documentation from the pull request is available at: docu-html

[Copilot]

Pull request overview

Adds a new heartbeat monitor (HMON) to the Rust health monitoring library and integrates it into the existing monitoring worker/supervisor notification flow.

Changes:

• Introduces heartbeat module (monitor + atomic state) and integrates heartbeat monitors into HealthMonitorBuilder/HealthMonitor.
• Updates the monitor evaluation interface to accept a shared hmon_starting_point and wires it through the monitoring worker thread.
• Refactors SupervisorAPIClient into a dedicated module with selectable implementations via Cargo features.

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
src/health_monitoring_lib/rust/worker.rs	Passes a shared HMON start instant into monitor evaluations; moves supervisor client trait out.
src/health_monitoring_lib/rust/supervisor_api_client/mod.rs	Adds feature-selected SupervisorAPIClient + implementation alias.
src/health_monitoring_lib/rust/supervisor_api_client/stub_supervisor_api_client.rs	New stub client implementation.
src/health_monitoring_lib/rust/supervisor_api_client/score_supervisor_api_client.rs	New SCORE client implementation.
src/health_monitoring_lib/rust/lib.rs	Adds heartbeat monitors to builder + start flow; uses new supervisor client impl selector.
src/health_monitoring_lib/rust/heartbeat/mod.rs	Exposes heartbeat monitor API.
src/health_monitoring_lib/rust/heartbeat/heartbeat_state.rs	Adds atomic packed heartbeat state and tests.
src/health_monitoring_lib/rust/heartbeat/heartbeat_monitor.rs	Implements heartbeat monitor logic + tests (incl. loom).
src/health_monitoring_lib/rust/deadline/deadline_monitor.rs	Adapts deadline evaluation to new evaluator signature and shared start instant.
src/health_monitoring_lib/rust/common.rs	Extends evaluation error types; adds duration_to_u32; updates evaluator trait signature.
src/health_monitoring_lib/Cargo.toml	Adds optional monitor_rs, loom target dep, and feature defaults.
src/health_monitoring_lib/BUILD	Enables score_supervisor_api_client feature in Bazel builds.
Cargo.toml	Updates workspace defaults and adds cfg(loom) lint configuration.

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Pull request overview

Copilot reviewed 15 out of 16 changed files in this pull request and generated 3 comments.

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Pull request overview

Copilot reviewed 15 out of 16 changed files in this pull request and generated 3 comments.

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Pull request overview

Copilot reviewed 15 out of 16 changed files in this pull request and generated 4 comments.

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Pull request overview

Copilot reviewed 17 out of 18 changed files in this pull request and generated 4 comments.

Comments suppressed due to low confidence (1)

src/health_monitoring_lib/rust/worker.rs:126

• next_sleep_time = interval - now.elapsed() can panic if the loop body takes longer than interval (or the thread is delayed), because Duration subtraction underflows. Use interval.saturating_sub(now.elapsed()) (and optionally log when the cycle is overrun) to avoid crashing the monitoring thread under load.

                        break;
                    }

                    next_sleep_time = interval - now.elapsed();
                }

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