What Traffic Quality Metrics Do You Monitor Most Closely?

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When analyzing website traffic, most people focus on clicks, impressions, and conversions. However, I've found that traffic quality metrics can often reveal issues before they impact campaign performance.

Some of the metrics I pay attention to include:

Bounce rate
Average session duration
Pages per session
Geographic distribution
Device distribution
Returning visitors
Conversion rate by traffic source

I'm curious to know what metrics other webmasters and marketers consider most important when evaluating traffic quality.

Have you discovered any unusual patterns that helped you identify low-quality traffic or improve campaign performance?

Looking forward to hearing your insights.