Cherry-pick #11394 to 7.x: Add add_observer_metadata processor
#11919
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Cherry-pick of PR #11394 to 7.x branch. Original message:
Resolves #11379 via addition of new
add_observer_metadata
processor.In addition to creating the processor this PR extracts out the common operations between
add_observer_metadata
andadd_host_metadata
forgeo
andnetinfo
fields into a newprocessors/util
package.Please note that the
observer
ECS field does not contain the same values thathost
does. See the ECS Observer Spec for more info.