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ORES web worker memory usage graph is meaningless
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Description

This is because of the difficulty in determining actual resident memory usage. For example,
https://grafana-admin.wikimedia.org/dashboard/db/ores?orgId=1&refresh=1m&from=1513253617045&to=1513257157045

We're not using 160GB of memory on a box with 64GB of physical memory and no swap.

We need a way of measuring actual memory usage. There are tools that can do this, but I'm not sure any of the existing metrics are usable.