[dnsdist] dnsdist statistics/chart webpage consumes gig of memory on chrome browser

[Mangesh Bhamre]

Hello dnsdist team,

If you keep the dnsdist web page running in a tab for hours, it consumes
up-to 2 GB RAM.  I kept a tab running the dnsdist stats page for 3-4 hours
and twice observed huge memory consumption.

Closing the chrome tab shows huge amount of memory been freed.  Have a
look. Nothing urgent, but worth fixing.

Regards,
Mangesh Bhamre
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