Defining and Using Key Metrics to Master Performance Measurements

on YouTube ↗27m

" summary

Explains that metrics are labeled collections of function costs (wall time, CPU, I/O, memory) gathered by the Blackfire probe, shows hundreds of built‑ins and how to define custom ones in .blackfire.yml with selectors, uses PHP SDK markers that are no‑ops without a profile, demonstrates timeline markers and the metrics explorer, proves a test failing because a metric count is 23 calls when it should be zero, and shows argument‑capturing that splits nodes in the call graph.

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" chapters (8)

1. 0:00Start
2. 0:13What Are Metrics
3. 1:10Timeline View
4. 4:15Recommended Recommendations
5. 5:35Built-In Metrics with Blackfire
6. 8:27Define Metrics
7. 10:47Selector
8. 21:58The Metrics Explorer

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