converter

Converter Processor Plugin

The converter processor is used to change the type of tag or field values. In addition to changing field types it can convert between fields and tags.

Values that cannot be converted are dropped.

Note: When converting tags to fields, take care to ensure the series is still uniquely identifiable. Fields with the same series key (measurement + tags) will overwrite one another.

Note on large strings being converted to numeric types: When converting a string value to a numeric type, precision may be lost if the number is too large. The largest numeric type this plugin supports is float64, and if a string 'number' exceeds its size limit, accuracy may be lost.

Note on multiple measurement or timestamps: Users can provide multiple tags or fields to use as the measurement name or timestamp. However, note that the order in the array is not guaranteed!

Global configuration options

In addition to the plugin-specific configuration settings, plugins support additional global and plugin configuration settings. These settings are used to modify metrics, tags, and field or create aliases and configure ordering, etc. See the CONFIGURATION.md for more details.

Configuration

# Convert values to another metric value type
[[processors.converter]]
  ## Tags to convert
  ##
  ## The table key determines the target type, and the array of key-values
  ## select the keys to convert.  The array may contain globs.
  ##   <target-type> = [<tag-key>...]
  [processors.converter.tags]
    measurement = []
    string = []
    integer = []
    unsigned = []
    boolean = []
    float = []

    ## Optional tag to use as metric timestamp
    # timestamp = []

    ## Format of the timestamp determined by the tag above. This can be any of
    ## "unix", "unix_ms", "unix_us", "unix_ns", or a valid Golang time format.
    ## It is required, when using the timestamp option.
    # timestamp_format = ""

  ## Fields to convert
  ##
  ## The table key determines the target type, and the array of key-values
  ## select the keys to convert.  The array may contain globs.
  ##   <target-type> = [<field-key>...]
  [processors.converter.fields]
    measurement = []
    tag = []
    string = []
    integer = []
    unsigned = []
    boolean = []
    float = []

    ## Optional field to use as metric timestamp
    # timestamp = []

    ## Format of the timestamp determined by the field above. This can be any
    ## of "unix", "unix_ms", "unix_us", "unix_ns", or a valid Golang time
    ## format. It is required, when using the timestamp option.
    # timestamp_format = ""

Example

Convert port tag to a string field:

[[processors.converter]]
  [processors.converter.tags]
    string = ["port"]

- apache,port=80,server=debian-stretch-apache BusyWorkers=1,BytesPerReq=0
+ apache,server=debian-stretch-apache port="80",BusyWorkers=1,BytesPerReq=0

Convert all scboard_* fields to an integer:

[[processors.converter]]
  [processors.converter.fields]
    integer = ["scboard_*"]

- apache scboard_closing=0,scboard_dnslookup=0,scboard_finishing=0,scboard_idle_cleanup=0,scboard_keepalive=0,scboard_logging=0,scboard_open=100,scboard_reading=0,scboard_sending=1,scboard_starting=0,scboard_waiting=49
+ apache scboard_closing=0i,scboard_dnslookup=0i,scboard_finishing=0i,scboard_idle_cleanup=0i,scboard_keepalive=0i,scboard_logging=0i,scboard_open=100i,scboard_reading=0i,scboard_sending=1i,scboard_starting=0i,scboard_waiting=49i

Rename the measurement from a tag value:

[[processors.converter]]
  [processors.converter.tags]
    measurement = ["topic"]

- mqtt_consumer,topic=sensor temp=42
+ sensor temp=42

Set the metric timestamp from a tag:

[[processors.converter]]
  [processors.converter.tags]
    timestamp = ["time"]
    timestamp_format = "unix

- metric,time="1677610769" temp=42
+ metric temp=42 1677610769

This is also possible via the fields converter.