All values sent to *collectd* must have an associated type. The type
defines the acceptable range of values. Types are defined in a simple
text file database. *collectd* loads all of the databases specified by
`TypesDB` directives in its configuration file. When configuring a
custom types database, the default database needs to be specified
explicitly; it will not be loaded automatically if there are any
`TypesDB` directives in the configuration.
Dustin C. Hatch
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