Metrics for Web Applications

Andrei Savu - asavu@axemblr.comNetcamp 2012

Me

• Founder of Axemblr.com

• Bucharest Java User Group (bjug.ro)

• Worked for Facebook & Adobe

• Connect with me on LinkedIn

Overview

• Why measure?

• Infrastructure vs. Business Metrics

• SaaS Metrics

• Resources

• Questions

Why measure?

Infrastructure Metrics

CPU

Network

Disk Usage

Bandwidth

RAID

IOPS

System Load

Memory UsageSessions

Infrastructure Metrics

• If it moves it should have a Graph

• Valuable for historical reasons

• Think “flight deck”

• You can know in advance when bad things happen (e.g. Black Friday)

Business Metrics

COGSLTV

CAC

Conversion Rate

Churn

Cohort AnalysisProfitability

MRRCash

SaaS MetricsActionable Metrics for SaaS companies

http://www.forentrepreneurs.com/saas-metrics/

Key Goals

Profitability

Guidelines

MRR

Customer Profitability

Customer Profitability

Cost of Acquiring Cust.

LTV = ARPU * LT - GOGSLT (life time) = 1 / Churn

Churn Rate

Cohort Analysis

Two Key Variables

Key Points

• Unified System for Metrics (Facebook like)(e.g. cpu load & network vs. gogs)

• Measure, Analyse, Improve, Repeat

• Run Experiments (scientific methodology)

Thanks! Questions?Andrei Savu - asavu@axemblr.com

Twitter: @andreisavu

Resources #1

• Graphitehttp://graphite.wikidot.com/

• Nagioshttp://www.nagios.org/

• Gangliahttp://ganglia.sourceforge.net/

Resource #2

• Etsy: Measure Anything, Measure Everythinghttp://codeascraft.etsy.com/2011/02/15/measure-anything-measure-everything/

• Etsy: StatsDhttps://github.com/etsy/statsd

• Coda Hale Metricshttp://metrics.codahale.com/