HPA scale to zero

<div class="stage" data-phase="0"><div class="title">EXTERNAL QUEUE → HPA</div><div class="row scale"><div class="queue panel">QUEUE<strong>0</strong><i></i><i></i><i></i></div><span class="arrow">→</span><div class="pods panel">PODS<div class="boxes"><i></i><i></i><i></i></div></div></div><div class="sub">external metric remains when replicas = 0</div></div>

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