Adding dynamic tags to telegraf input

Question

We're using telegraf to collect CloudWatch data from AWS and output it to InfluxDB.

We need to add dynamic tags to the input, s.t if "instancId == 12345", add tag "user = 3"

Is there a way to do this?

Answer 1

Take a look at the processors. If you have just a set of known values that you want to work with, I think enum would be the best option. Here is the example updated for your case:

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

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

    ## Default value to be used for all values not contained in the mapping
    ## table.  When unset, the unmodified value for the field will be used if no
    ## match is found.
    default = 0

    ## Table of mappings
    [processors.enum.mapping.value_mappings]
      123 = 1
      1234 = 2
      12345 = 3

Answer 2

See the CONFIGURATION.md docs:

[[inputs.cpu]]
  percpu = false
  totalcpu = true
  [inputs.cpu.tags]
    tag1 = "foo"
    tag2 = "bar"