Release v1.4.0 and v0.28.0 · GoogleCloudPlatform/opentelemetry-operations-go

What's Changed

Allow users to override useragent by @dashpole in #322
Address a bunch of small TODOs by @dashpole in #314
Update release.go for latest release by @dashpole in #321
Rename files to be easier to understand, and add comment by @dashpole in #327
Fix formatting of summary quantile labels to match prometheus by @dashpole in #325
Update opentelemetry collector dependency, and switch away from deprecated functions. by @dashpole in #328
Sanitize label keys for metric descriptors by @dashpole in #331
Add attribute mapping function by @dashpole in #324
Normalize sums prior to exporting them by @dashpole in #323
Do not use IsZero on timestamps obtained from pdata by @dashpole in #336
Send summary counts as doubles instead of integers by @dashpole in #338
Drop data points with no value set by @dashpole in #339
Handle NaN sums in histograms and exponential histograms by @dashpole in #340
Fix typos around integration tests by @damemi in #345
Update fixtures based on upstream changes to the prometheus receiver by @dashpole in #346
feat(propagator): create a new one-way propagator by @muncus in #343
Demonstrate that integration tests aren't catching failures by @dashpole in #349
Update dependencies by @dashpole in #347
Address remaining nits from #347 by @dashpole in #351
Prepare for releasing v1.4.0 and v0.28.0 by @dashpole in #353

Full Changelog: v1.3.0...v1.4.0