1.
Metrics for Web
Applications
Andrei Savu - asavu@axemblr.com
Netcamp 2012

2.
Me
• Founder of Axemblr.com
• Bucharest Java User Group (bjug.ro)
• Worked for Facebook & Adobe
• Connect with me on LinkedIn

3.
Overview
• Why measure?
• Infrastructure vs. Business Metrics
• SaaS Metrics
• Resources
• Questions

4.
Why measure?

5.
Network Bandwidth
CPU
Disk Usage
Infrastructure Metrics
RAID System Load
IOPS
Sessions Memory Usage

6.
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)

7.
CAC
COGS
LTV Conversion Rate
Business Metrics
Churn
Profitability
Cohort Analysis
MRR
Cash

8.
SaaS Metrics
Actionable Metrics for SaaS companies
http://www.forentrepreneurs.com/saas-metrics/

9.
Key Goals

10.
Profitability

11.
Guidelines

12.
MRR

13.
Customer Profitability

14.
Customer Profitability

15.
Cost of Acquiring Cust.

16.
LTV = ARPU * LT - GOGS
LT (life time) = 1 / Churn

17.
Churn Rate

18.
Cohort Analysis

19.
Two Key Variables

20.
Key Points
• Unified System for Metrics (Facebook like)
(e.g. cpu load & network vs. gogs)
• Measure, Analyse, Improve, Repeat
• Run Experiments (scientific methodology)

21.
Thanks! Questions?
Andrei Savu - asavu@axemblr.com
Twitter: @andreisavu

22.
Resources #1
• Graphite
http://graphite.wikidot.com/
• Nagios
http://www.nagios.org/
• Ganglia
http://ganglia.sourceforge.net/

23.
Resource #2
• Etsy: Measure Anything, Measure Everything
http://codeascraft.etsy.com/2011/02/15/
measure-anything-measure-everything/
• Etsy: StatsD
https://github.com/etsy/statsd
• Coda Hale Metrics
http://metrics.codahale.com/