Werk #11878: Improved SNMP performance

Component	Checks & agents
Title	Improved SNMP performance
Date	Dec 15, 2020
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0b2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Some OIDs have been fetched multiple times during a run of the SNMP data source. These are now only fetched once, which leads to significant speed improvement (particularly for slow responding switches).

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