ression&rsquo;s
<a href=/v1.2/docs/reference/config/policy-and-telemetry/expression-language/#type-checking>inferred type</a>
must match the datatype of the field.</p><p>Example config:</p><pre><code class=language-yaml>apiVersion: &quot;config.istio.io/v1alpha2&quot;
kind: instance
metadata:
  name: default
  namespace: istio-system
spec:
  compiledTemplate: edge
  params:
    timestamp: request.time
    sourceUid: source.uid | &quot;Unknown&quot;
    sourceOwner: source.owner | &quot;Unknown&quot;
    sou