| // This is an example config to be used with the --probe-config switch. |
| { |
| "probes": { |
| "chrome_histograms": { |
| // metrics is a dictionary keyed by UMA histogram name, see |
| // chrome://histograms for histograms logged by a browser. Each histogram |
| // key has an array of metrics to generate. Metrics can be the following: |
| // * "count": the number of samples logged to the histogram. |
| // * "mean": the average value logged to the histogram. |
| // * "p{number}" (e.g. "p50", "p90"): The percentile value of samples |
| // logged to the histogram. APPROXIMATE. |
| "metrics": { |
| // E.g. the following line will create four entries in the results: |
| // * "WebVitals.FirstContentfulPaint3_count" |
| // * "WebVitals.FirstContentfulPaint3_mean" |
| // * "WebVitals.FirstContentfulPaint3_p50" |
| // * "WebVitals.FirstContentfulPaint3_p90" |
| "WebVitals.FirstContentfulPaint3": [ |
| "count" |
| "mean" |
| "p50" |
| "p90" |
| ] |
| // And another metrics are made from this histogram. |
| "Startup.FirstWebContents.NonEmptyPaint3": [ |
| "count" |
| "mean" |
| "p50" |
| "p90" |
| ] |
| } |
| } |
| } |
| } |
