Example of logging metadata set by a route? #6156
Description
In the envoy docs for core.Metadata, it says:
An example use of metadata is providing additional values to http_connection_manager in the envoy.http_connection_manager.access_log namespace.
I've tried to set metadata on a route with this namespace with the intention of it being logged by the parent listener, to no avail.
Here are the relevant snippets of my config:
RouteConfiguration:
version_info: '0'
resources:
- '@type': type.googleapis.com/envoy.api.v2.RouteConfiguration
name: foobar-route-config
virtual_hosts:
- name: foobar-virtualhost
domains:
- 'foobar.com'
routes:
- match:
prefix: /
route:
cluster: foobar-cluster
metadata:
filter_metadata:
envoy.http_connection_manager.access_log:
example: 'something'
Listener:
version_info: '0'
resources:
- '@type': type.googleapis.com/envoy.api.v2.Listener
name: foobar-listener
address:
socket_address:
address: 0.0.0.0
port_value: 80
protocol: TCP
filter_chains:
- filters:
- name: envoy.http_connection_manager
config:
stat_prefix: upstreams
codec_type: AUTO
idle_timeout: 300s
use_remote_address: yes
access_log:
- name: envoy.file_access_log
config:
path: /var/log/envoy/access.log
json_format:
my_metadata_value: "%DYNAMIC_METADATA(envoy.http_connection_manager.access_log:example)%"
- name: envoy.router
rds:
route_config_name: foobar-route-config
config_source:
api_config_source:
api_type: REST
cluster_names: [controlplane]
refresh_delay: 5s
These are responses sent by an envoy control-plane.
Am I doing this wrong? The value is logged as '-'.