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Plag

Lagger output plotter

plag is intended to receive a lagger log file from stdin (piped in, can be stream) and requires a --message to be provided. This message will be matched in the log entries, looking for a start and an end of that session.

e.g.:

{"timestamp":"1485269350.346349239","source":"test-app","message":"test-app.function-1.start","log_level":1,"data":{"session":"2"}}
{"timestamp":"1485269351.347641230","source":"test-app","message":"test-app.function-1.end","log_level":1,"data":{"session":"2"}}

If you want to track the metric above, --message should be test-app.function-1. start/end marks at the moment are:

  • "begin", "start", "starting", "started"
  • "finish", "end", "ending", "finished"

plag will then output these metrics to according to the options you provided, you can use one or more output options at the same time:

log | plag --message my.func --graph --csv out.csv --datadog-...

Options

CSV

Output points to a CSV file:

log | plag --message log.message.to.watch --csv out.csv

Datadog

Output points to datadog:

log | plag --message log.message.to.watch --datadog-api-key KEY --datadog-app-key APP-KEY --datadog-metric-name metric

Terminal graph

Plot points real-time as a graph on the terminal

graph example

log | plag --message log.message.to.watch --graph --graph-decay 20s
  • --graph-decay is used by the exponentially weighted moving average (ewma) function
  • pressing q will quit the plot

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