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[master] / config.toml 

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# Address to listen on. Prometheus should be told to scrape this.
listen_addr = ":8080"


# Expvar target.
# Name is for description only. There can be multiple of these.
[myserver]

# URL with the expvars to scrape and export.
url = "http://localhost:20099/debug/vars"

# From here on, everything is optional.

# List of variables to export.
# By default, the exporter will try to auto-convert all expvars.  It is only
# able to auto-convert float and boolean expvars without labels.
#
# In the configuration we can manually tell the exporter how to name the
# prometheus variables, which help message to use, and support labels (single
# level).
#
# Each variable is configured the following way:
#   m.<prometheus name>.expvar = "<expvar name>"
#   m.<prometheus name>.help = "<prometheus help message>"
#   m.<prometheus name>.label_name = "<expvar label name>"

m.var_a.expvar = "variable-a"

m.var_b.expvar = "variable-b"
m.var_b.help = "this is a counter of Bs, per hour of the day"
m.var_b.label_name = "hour_of_day"