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vm-image: Expose new LFC working set size metrics
In general, rename: - lfc_approximate_working_set_size to - lfc_approximate_working_set_size_seconds For the "main" metrics that are actually scraped and used internally, the old one is just marked as deprecated. For the "autoscaling" metrics, we're not currently using the old one, so we can get away with just replacing it. Also, for the user-visible metrics we'll only store & expose a few different time windows, to avoid making the UI overly busy or bloating our internal metrics storage. But for the autoscaling-related scraper, we aren't storing the metrics, and it's useful to be able to programmatically operate on the trendline of how WSS increases (or doesn't!) window size. So there, we can just output datapoints for each minute. Part of neondatabase/autoscaling#872. See also #7466.
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