[jcoene]

We measure web traffic with Google Analytics. Free, industry standard, works.

We measure app metrics and server/service health with Librato Metrics. A local statsd instance collects UDP packets from all over our infrastructure then consolidates and dumps them out to Librato every 60 seconds. We track thousands of data points every minute and it keeps up without issue. Librato offers great and flexible visualization of your data without breaking the bank - highly recommended.

[josephruscio]

Co-Founder/CTO at Librato here, just wanted to say thanks for the kind words, and include a link ;-): http://librato.com