From 05d22959a4bd125f3b0f7c0d6c5e8312d72362f9 Mon Sep 17 00:00:00 2001
From: x1e9 <75582606+x1e9@users.noreply.github.com>
Date: Fri, 30 Sep 2022 14:31:48 +0200
Subject: [PATCH] Prevent Marathon to scale down instances to zero (#62)

When :
- a deployment is stuck in an unsuccessful state (constraint
impossible to satisfy)
- maximumOverCapacity is used
- a new deployment has been requested and cancelled

The periodic scale thread removes all instances because number of
instances to decom is processed as max(goalRunning-scaleTo,
sentencedTasks).

This patch aims to change this behaviour by using number of actual
instances running instead of target number of instances (goalRunning).

JIRA: MESOS-5576