Istio generates the following metrics:</p><ul><li><p><strong>Request Count</strong> (<code>istio_requests_total</code>): This is a <code>COUNTER</code> incremented for every request handled by an Istio proxy.</p></li><li><p><strong>Request Duration</strong> (<code>istio_request_duration_milliseconds</code>): This is a <code>DISTRIBUTION</code> which measures the duration of requests.</p></li><li><p><strong>Request Size</strong> (<code>istio_request_bytes</code>): This is a <code>DISTRIBUTION</code> which me