For metrics and metrics only (not events or service checks), a tag starting with host: should set the hostname, and be removed from the tags list.
In both the python and golang agents, tags are deduplicated.
The golang client appears to quantize stats into 10 second intervals, but upload every 15 seconds (see pkg/aggregator/aggregator.go ). Not sure how this works exactly, it uploads one or two sets of metrics every 15s?
// DefaultFlushInterval aggregator default flush interval
const DefaultFlushInterval = 15 * time.Second // flush interval
const bucketSize = 10 // fixed for now
The python agent (version 5), has dd-agent/dogstatsd.py:
# Dogstatsd constants in seconds
77 DOGSTATSD_FLUSH_INTERVAL = 10
78 DOGSTATSD_AGGREGATOR_BUCKET_SIZE = 10