add ability to disable unqualified hostname lookups #42952
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@fspmarshall See the table below for backport results.
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Adds the ability to disable unqualified hostname lookups via
TELEPORT_UNSTABLE_DISABLE_UNQUALIFIED_LOOKUPS=yes. Depending on the configuration and usage of a teleport cluster, some teleport clusters produce a massive amount of ineffectual DNS lookups for unqualified hostnames (mostly server IDs). This can become problematic for very large clusters experiencing very high usage.