HP had their own ProCurve networking and they also bought Aruba.
We don't know what HPE is going to do to Juniper specifically, but in general many acquisitions either raise prices or simplify the product line by canceling some products. In this case HPE may cancel some Aruba products and replace them with Mist equivalents.
They also inherited 3Com from HP and the range of H3C switches were far superior to ProCurve for many years. I think they only offloaded their stake last year.
We don't know what HPE is going to do to Juniper specifically, but in general many acquisitions either raise prices or simplify the product line by canceling some products. In this case HPE may cancel some Aruba products and replace them with Mist equivalents.