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feat: caller headers forwarded to the outbound traffic

Diego Molteni requested to merge slb/dm3/header-fw into master

Enabled called header propagation on services outbound traffic. default forwarded fields are (ref):

  • x-correlation-id
  • x-variant-id
  • x-feature-flags
  • x-request-id
  • x-b3-traceid
  • x-b3-spanid
  • x-b3-parentspanid
  • x-b3-sampled
  • x-b3-flags
  • x-ot-span-context

The default forward configuration can be changed, by specifying the list of headers to forward in the env variable CALLER_FORWARD_HEADERS as comma-separated strings list, no spaces

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