Imports github.com/signalfx/golib/log github.com/signalfx/golib/event github.com/signalfx/golib/sfxclient/spanfilter github.com/signalfx/golib/sfxclient github.com/signalfx/golib/datapoint github.com/signalfx/golib/trace Standard library imports context encoding/json fmt net/http sync sync/atomic time expvar