Set Metadata¶
This filter should be configured with the name envoy.filters.http.set_metadata.
This filters adds or updates dynamic metadata with static data.
Dynamic metadata values are updated with the following scheme. If a key does not exists, it’s just copied into the current metadata. If the key exists but has a different type, it is replaced by the new value. Otherwise:
for scalar values (null, string, number, boolean) are replaced with the new value
for lists: new values are added to the current list
for structures: recursively apply this scheme
For instance, if the namespace already contains this structure:
myint: 1
mylist: ["a"]
mykey: ["val"]
mytags:
tag0: 1
and the value to set is:
myint: 2
mylist: ["b","c"]
mykey: 1
mytags:
tag1: 1
After applying this filter, the namespace will contain:
myint: 2
mylist: ["a","b","c"]
mykey: 1
mytags:
tag0: 1
tag1: 1
Statistics¶
Currently, this filter generates no statistics.