Issue title: List of Data Analysis Tasks for SREs
 Issue body: Apparat from rich knowledge about hardware, operating systems and software engineering, there is a fair bit of data that is generated by users and machines, that needs to be analyzed. This document gathers examples of such applications.

Please contribute, and vote for things you find important.
 Comments: 
 Comment 0: Calculate the Uptime of a node or a service over a given amount of time
 Comment 1: Understand the data presented in graphs presented by monitoring tools:
- Display period vs. Aggregation Period, (SpikeErosion)[http://www.circonus.com/spike-erosion/]
 Comment 2: Monitor and calculate percentiles of API latencies over:
- different time periods
- different levels of aggregation (node, service, endpoint)
 Comment 3: Select appropriate metrics to monitor an new service for availablility and service quality
 Comment 4: Determining the demarcation line between hardware and software issues

i.e. correlating info in different graphs to pinpoint the issue quickly
e.g. if load is high and transactions per second is not increasing we could have saturated the NIC or have run out of bandwidth from the provider side, or it could be the cache hit ratio in the database

Contributed by Riley Berton
 Comment 5: Be proactive - effectively predict problematic behavior.
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