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Enum Processor Plugin

The Enum Processor allows the configuration of value mappings for metric tags or fields. The main use-case for this is to rewrite status codes such as red, amber and green by numeric values such as 0, 1, 2. The plugin supports string and bool types for the field values. Multiple tags or fields can be configured with separate value mappings for each. Default mapping values can be configured to be used for all values, which are not contained in the value_mappings. The processor supports explicit configuration of a destination tag or field. By default the source tag or field is overwritten.

Configuration:

[[processors.enum]]
  [[processors.enum.mapping]]
    ## Name of the field to map
    field = "status"

    ## Name of the tag to map
    # tag = "status"

    ## Destination tag or field to be used for the mapped value.  By default the
    ## source tag or field is used, overwriting the original value.
    dest = "status_code"

    ## Default value to be used for all values not contained in the mapping
    ## table.  When unset and no match is found, the original field will remain 
    ## unmodified and the destination tag or field will not be created.
    # default = 0

    ## Table of mappings
    [processors.enum.mapping.value_mappings]
      green = 1
      amber = 2
      red = 3

Example:

- xyzzy status="green" 1502489900000000000
+ xyzzy status="green",status_code=1i 1502489900000000000

With unknown value and no default set:

- xyzzy status="black" 1502489900000000000
+ xyzzy status="black" 1502489900000000000