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Framework for emitting metrics data (project-chip#32223)
* Rerouted tracing macros to Darwin signposts * Initial framework for logging scalar data event * Handled the new metrics event changes in collector * Modified VerifyOrExit macro to accept an optional metric key as third argument * Removed direct use of chrono in metrics_event.h Switched MTRMetrics to vend dictionary for metric keys * Modified SuccessOrExit to optionally accept metric key * Moved metric keys to separate header Reworked metric_event names for more clarity * Switched MATTER_TRACE_METRIC usage to MATTER_LOG_METRIC * Restyle fixes * Fixed unit tests * Fixed build failure due to MetricEvent hidden inside tracing enabled * Fixing one source of build error * Fixing darwin build failure * Code Review: Rename LogMetric to LogMetricEvent * Code Review Suggestions: 1. Metric Macros take full string constants and no longer use preprocessor to prefix. Allows free flowing strings 2. Reworked MetricEvent class and documented 3. Handled LogEventMetric for Darwin, ESP32, Perfetto, JSON to account for all types 4. Removed timePoint from MetricEvent class. Timestamps and duration calculation is now responsibility for the handlers of the event 5. Reverted BUILD.gn in system to not break out SystemClock.h * Code Review Feedback #2: 1. Added SuccessOrExitWithMetric and VerifyOrExitWithMetric 2. Cleaned up support .gn to remove dependedency on metrics * Code Review Feedback project-chip#3: 1. Added ScopedMetricEvent to use RAII to track begin and end within a scope * Code Review project-chip#4: Reverted an accidental removal * Added MTRMetricData to description as per review comment * Restyler fixes * Sample code of how Begin and End log metrics can be used * Fixed compilation error when tracing is disabled * Fixes for build failures when tracing is disabled * Picked up code review suggestion accidently dropped * Code Review Feedback: 1. Begin metric does not take value 2. Allow undefined value for metric 3. Misc other feedback * Handle undefined value and error value * Revert a comment change * Review Feedback: Changed ScopedMetricEvent to capture error by reference * Fixed another build failure * Reverting usage of LOG_METRICS * Review feedback: Fix incorrect documentation * Code Review Feedback: Remove access to Value in MetricEvent to avoid incorrect access * Restyler fixes * Unregistering backend in Darwin shutdown * Resytler fixes...
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