event: separate metric types with Record methods

This is an alternative to having metrics as builders. Instead we use
the same builder for everything, but BuilderMetric takes a type that
is a pair of a Metric and Value. These pairs are created by the Record
metric of each Metric type.

This has the main advantage of separate builders -- typed metric
values -- without the downsides of repeated code, both in the
implementation and the client.

Change-Id: I8d39880b364975416e6fe94f6545fd3fe201aa61
Reviewed-on: https://go-review.googlesource.com/c/exp/+/326390
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Cottrell <iancottrell@google.com>
6 files changed
tree: 1da83e7b88f7ca5e044cc1f723266e4a099c7ffb
  1. apidiff/
  2. cmd/
  3. ebnf/
  4. ebnflint/
  5. errors/
  6. event/
  7. fsnotify/
  8. inotify/
  9. io/
  10. mmap/
  11. rand/
  12. shiny/
  13. shootout/
  14. sumdb/
  15. utf8string/
  16. winfsnotify/
  17. .gitattributes
  18. .gitignore
  20. codereview.cfg
  23. go.mod
  24. go.sum
  27. README.md



This subrepository holds experimental and deprecated (in the old directory) packages.

The idea for this subrepository originated as the pkg/exp directory of the main repository, but its presence there made it unavailable to users of the binary downloads of the Go installation. The subrepository has therefore been created to make it possible to go get these packages.

Warning: Packages here are experimental and unreliable. Some may one day be promoted to the main repository or other subrepository, or they may be modified arbitrarily or even disappear altogether.

In short, code in this subrepository is not subject to the Go 1 compatibility promise. (No subrepo is, but the promise is even more likely to be violated by go.exp than the others.)

Caveat emptor.