Werk #10839: if.include: Fix missing performance data of interface groups on clusters

Component	Checks & agents
Title	if.include: Fix missing performance data of interface groups on clusters
Date	Mar 17, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p11 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Interface groups may be configured on clusters. In order to detect counter wraps all metrics of each interface of the cluster nodes are checked. In the counter names the node name was missing. This led to empty performance data because counter wraps were wrongly detected.

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