[processor] Join attribtues processor

[edenkoveshi]

Description

A new processor to join values of chosen attributes and populate them as a value of another attribute using a chosen separator. If the target attribute already exists it is not overriden by default, but it can be configured.

Supported pipeline types: traces

Full proccessor configuration is given in the following example

processors:
  join_attributes:
    # An array of attribute keys whose values are to be joined.
    attributes: ["attribute-1",...,"attribute-N"]
    # A key of an attribute that will be populated with the new value.
    target_attribute: "some-attribute"
    # A character/string to separate the values.
    separator: ","

  join_attributes/override:
    # An array of attribute keys whose values are to be joined.
    attributes: ["attribute-1",...,"attribute-N"]
    # A key of an attribute that will be populated with the new value.
    target_attribute: "some-attribute"
    # A character/string to separate the values.
    separator: ","
    # If the target attribute already has a value, override it. (default is false)
    override: true

Tested and documented

[mx-psi]

Hey there! Thanks for your contribution. New components need to follow the contributing guidelines for new components, which includes creating a new issue using this template. You need to do this before this component gets added to contrib.

Nonetheless I think this may fit better as a function on the transform processor. cc @TylerHelmuth @kentquirk to evaluate this

[TylerHelmuth]

@edenkoveshi would this issue cover your needs? #12476. That issue details a solution to concat any number of strings in the transform processor, which could then be used to set an attribute.

[edenkoveshi]

@edenkoveshi would this issue cover your needs? #12476. That issue details a solution to concat any number of strings in the transform processor, which could then be used to set an attribute.

It does, but I think as a principle, there should be simple processors for doing simple operations (like most of them really) rather than a complex processor and a new query language.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[github-actions]

Closed as inactive. Feel free to reopen if this PR is still being worked on.