handler StatsiteHandler

StatsiteHandler

Send metrics to a Statsite using the default interface.

Statsite

This is a stats aggregation server. Statsite is based heavily on Etsy's StatsD. This is a re-implementation of the Python version of statsite.

Features

• Basic key/value metrics
• Send timer data, statsite will calculate:
  • Mean
  • Min/Max
  • Standard deviation
  • Median, Percentile 95, Percentile 99
• Send counters that statsite will aggregate

Architecture

Statsite is designed to be both highly performant, and very flexible. To achieve this, it implements the stats collection and aggregation in pure C, using libev to be extremely fast. This allows it to handle hundreds of connections, and millions of metrics. After each flush interval expires, statsite performs a fork/exec to start a new stream handler invoking a specified application. Statsite then streams the aggregated metrics over stdin to the application, which is free to handle the metrics as it sees fit.

This allows statsite to aggregate metrics and then ship metrics to any number of sinks (Graphite, SQL databases, etc). There is an included Python script that ships metrics to graphite.

Additionally, statsite tries to minimize memory usage by not storing all the metrics that are received. Counter values are aggregated as they are received, and timer values are stored and aggregated using the Cormode-Muthurkrishnan algorithm from "Effective Computation of Biased Quantiles over Data Streams". This means that the percentile values are not perfectly accurate, and are subject to a specifiable error epsilon. This allows us to store only a fraction of the samples.

Options - Generic Options

Setting	Default	Description	Type
get_default_config_help		get_default_config_help
host			str
server_error_interval	120	How frequently to send repeated server errors	int
tcpport	1234		int
timeout	5		int
udpport	1234		int

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