DestinationRuleSubsetNotSelectPods

Message Name	DestinationRuleSubsetNotSelectPods
Message Code	IST0173
Description	Subsets defined in destination does not select any pods.
Level	Error

This message occurs when a subset in a DestinationRule does not select any pods.

Requests that are routed to this subset fail with a 503 error and the UH (no healthy upstream) response flag.

An example

Consider this DestinationRule, when no reviews pod has the label version: v4:

apiVersion: networking.istio.io/v1
kind: DestinationRule
metadata:
  name: reviews
spec:
  host: reviews
  subsets:
  - name: v1
    labels:
      version: v1
  - name: v4
    labels:
      version: v4

You will receive this message:

Error [IST0173] (DestinationRule default/reviews) The Subset v4 defined in the DestinationRule does not select any pods. Which may lead to 503 UH (NoHealthyUpstream).

How to resolve

Do one of these:

Change the labels of the subset so that they select the correct pods.
Deploy the pods that the subset must select.
Remove the subset if you do not use it.