removed backwards-compatible/untagged metrics deprecated in 0.7 #9080
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Nomad v0.7.0 introduced tagged metrics that were incompatible with previous emitted metrics. Two new configurations were added to gate this new behavior: one to enable/disabled the tagged metrics, one to enable/disable the backwards compatible metrics. At that point in time, the untagged metrics were marked as deprecated.
That was a long time ago. This PR fulfills the prophecy of that deprecation and removes the BC metrics, as well as removes the fields for the deprecated configuration.