How to add upstream host into OpenTelemetry's resources about accessLog?

[nealwei2008]

I create an EnvoyProxy to config OpenTelemetry as asseccLog output method.The data flow like otle-collector -> Loki -> Grafana. I want to add "UPSTREAM_HOST" as Loki's label. How can I do it?

apiVersion: gateway.envoyproxy.io/v1alpha1
kind: EnvoyProxy
metadata:
  name: otel-access-logging
  namespace: envoy-gateway-system
spec:
  telemetry:
    accessLog:
      settings:
        - format:
            type: Text
            text: |
              [%START_TIME%] "%REQ(:METHOD)% %REQ(X-ENVOY-ORIGINAL-PATH?:PATH)% %PROTOCOL%" %RESPONSE_CODE% %RESPONSE_FLAGS% %BYTES_RECEIVED% %BYTES_SENT% %DURATION% "%REQ(X-FORWARDED-FOR)%" "%REQ(USER-AGENT)%" "%REQ(X-REQUEST-ID)%" "%REQ(:AUTHORITY)%" "%UPSTREAM_HOST%"
          sinks:
            - type: OpenTelemetry
              openTelemetry:
                host: otel-collector.monitoring.svc.cluster.local
                port: 4317
                resources:
                  k8s.cluster.name: "cluster-1"
                  service.name: "envoy-gateway"

[zirain]

you can use transform processor

    processors:
      # loki create index for resource attributes, so need to move k8s attributes from log to resource
      transform/loki:
        log_statements:   
          - context: log
            statements:
              - set(resource.attributes["exporter"], "OTLP")
              - set(resource.attributes["k8s.namespace.name"], log.attributes["k8s.namespace.name"])
              - delete_key(log.attributes, "k8s.namespace.name")

gateway/charts/gateway-addons-helm/values.yaml

Line 887 in b72afb7

processors:

[nealwei2008]

It works for me, 3Q