On maintenance

On maintenance

Hi.
What's the meaning of gray color in Availability graphic? Why some devices turn to this color automaticly? The status display is still green, but the Availability graphic is gray.
I try to click on Actions/Monitoring, but nothing changes.  The Uptime at Availability report shows 100% for the last days, but a crazy value to last 30 days.

Anyone can help me?

Thanks.
Antonio.

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