Empty map placeholder

Policies and Telemetry
1

I’m trying to create an instance as follows:

apiVersion: "config.istio.io/v1alpha2"
kind: instance
metadata:
  name: accesslog
  namespace: istio-system
spec:
  compiledTemplate: logentry
  params:
    severity: '"Default"'
    timestamp: request.time
    variables:
      sourceIp: source.ip | ip("0.0.0.0")
      sourceLabels: source.labels | map[""]""
      requestPath: request.path	| ""

I’ve tried several flavour for the empty map map[""]"" such as map[string]string but none of them is accepted. The documentation I’ve read has no example of setting an empty map either. How can I declare an empty map?

2

Please use emptyStringMap().

3

Found in the doc: https://istio.io/docs/reference/config/policy-and-telemetry/expression-language/

emptyStringMap - Create an empty string map

Example use: request.headers | emptyStringMap()

apiVersion: "config.istio.io/v1alpha2"
kind: instance
metadata:
  name: accesslog
  namespace: istio-system
spec:
  compiledTemplate: logentry
  params:
    severity: '"Default"'
    timestamp: request.time
    variables:
      sourceIp: source.ip | ip("0.0.0.0")
      sourceLabels: source.labels | emptyStringMap()
      requestPath: request.path | ""