Add basic doc for IST0112 (#5592)

* Add basic doc for IST0112

* fix link

* Update content/en/docs/reference/config/analysis/ist0112/index.md

Co-Authored-By: Martin Taillefer <geeknoid@users.noreply.github.com>
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Chris Wilson 2019-11-11 10:03:53 -08:00 committed by Istio Automation
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---
title: VirtualServiceDestinationPortSelectorRequired
layout: analysis-message
---
This message occurs when a virtual service routes to a service with more than one port exposed, but does not specify which one to use. This ambiguity can lead to undefined behavior.
To fix, add a `port` to the virtual service [Destination](/docs/reference/config/networking/virtual-service/#Destination) to disambiguate which service port should be routed to.