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doc.go
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
/*
Package tag contains OpenCensus tags.
Tags are key-value pairs. Tags provide additional cardinality to
the OpenCensus instrumentation data.
Tags can be propagated on the wire and in the same
process via context.Context. Encode and Decode should be
used to represent tags into their binary propagation form.
This package supports a restrictive set of characters in tag keys which
we believe are supported by most metrics backends. Tag values are not limited in
this way, but specific exporters may have their own restrictions on tag
values and if so, should provide a way to sanitize tag values for use
with that backend.
*/
package tag // import "go.opencensus.io/tag"