Function for adding custom attributes on the span
The number of timing resources is limited, after the limit (chrome 250, safari 150) the information is not collected anymore. The only way to prevent that is to regularly clean the resources whenever it is possible. This is needed only when PerformanceObserver is not available
Ignore adding network events as span events
URLs that partially match any regex in ignoreUrls will not be traced. In addition, URLs that are exact matches of strings in ignoreUrls will also not be traced.
Measure outgoing request size
URLs which should include trace headers when origin doesn't match
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XMLHttpRequest config