* source stats reporter... should be used by well-behaved sources
* public fields
* moving serialization/deserialization of metrics and logging maps to pkg
* nits
* adding UT
* same order
* updates
* sock-puppet
* unregistration problem?
* removing base64 encoding
* removing TODO
* removing config changes... done in another PR
* to properly address the comment
* changing importer to source
* split and update
* bug fixed
* change the copyright year
* use fake metadata in tests
* exclude test coverage for gcp_metadata
* add record
* add tests
* revert 2019 and add a new var
* change documents
* address comment
* change line
* split and update
* bug fixed
* change the copyright year
* use fake metadata in tests
* exclude test coverage for gcp_metadata
* revert 2019 change on existing files