Fix incorrect metric doc for memory.utilization
Fixed the metric documentation for memory.utilization to reflect the
actual calculation that the metadata plugin is using
@@ -7,14 +7,14 @@ metric_type: gauge
This metric shows the amount of memory in use on this machine, as a percent of total memory available.
-The SignalFx metadata plugin computes this metric based on the metrics output by the `memory` plugin for collectd and the `mem` plugin for Telegraf. First, compute the ratio of `memory.free` or `mem.free` to the sum of all memory metrics. Next, subtract that number from 1 to yield the ratio of memory that is not free, and multiply by 100 to display as percent, as follows:
+The SignalFx metadata plugin computes this metric based on the metrics output by the `memory` plugin for collectd and the `mem` plugin for Telegraf. The calculation used is as follows:
collectd
```
-100 * [1 - memory.free / sum(memory.*)]
+1.0 * memory.used / sum (memory.*) * 100
```
Telegraf
```
-100 * [1 - mem.free / sum(mem.*)]
+1.0 * mem.used / sum (mem.*) * 100
```
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