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<!---
* Copyright 2015 gRPC 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.
-->
# Census - a resource measurement and tracing system
This directory contains code for Census, which will ultimately provide the
following features for any gRPC-using system:
* A [dapper](http://research.google.com/pubs/pub36356.html)-like tracing
system, enabling tracing across a distributed infrastructure.
* RPC statistics and measurements for key metrics, such as latency, bytes
transferred, number of errors etc.
* Resource measurement framework which can be used for measuring custom
metrics. Through the use of [tags](#Tags), these can be broken down across
the entire distributed stack.
* Easy integration of the above with
[Google Cloud Trace](https://cloud.google.com/tools/cloud-trace) and
[Google Cloud Monitoring](https://cloud.google.com/monitoring/).
## Concepts
### Context
### Operations
### Tags
### Metrics
## API
### Internal/RPC API
### External/Client API
### RPC API
## Files in this directory
Note that files and functions in this directory can be split into two
categories:
* Files that define core census library functions. Functions etc. in these
files are named census\_\*, and constitute the core census library
functionality. At some time in the future, these will become a standalone
library.
* Files that define functions etc. that provide a convenient interface between
grpc and the core census functionality. These files are all named
grpc\_\*.{c,h}, and define function names beginning with grpc\_census\_\*.
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