Purges the metric, tag key and tag value UID to string and string to UID maps.
The command format is:
dropcaches
An acknowledgement after the caches have been purged.
Caches dropped.
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Licensed under the GNU LGPLv2.1+ and GPLv3+ licenses.
http://opentsdb.net/docs/build/html/api_telnet/dropcaches.html