Merge pull request #64 from prometheus/superq/50

proposal: Remove copyright dates

Author: SuperQ

proposals/0050-remove-copyright-dates.md

@@ -0,0 +1,36 @@
+## Remove copyright dates
+
+* **Owners**
+  * Ben Kochie ([@SuperQ](https://github.com/SuperQ))
+
+* **Implementation**: Accepted
+
+* **Related Issues and PRs:**
+  * https://github.com/prometheus/proposals/issues/50
+
+* **Other docs or links:**
+  * https://github.com/cncf/foundation/blob/main/copyright-notices.md
+
+> CONSENSUS: We agree that we want to remove the date from the license headers from our files
+
+## Why
+
+The CNCF copyright notice guidelines recommend against including dates/years in them.
+
+We should, on a best effort basis, remove the year from the notice headers on our projects. This would reduce the issues with having to deal with PRs copy-and-pasting the wrong year when creating new files.
+
+## How
+
+The new copyright header at the beginning of source files:
+
+```
+// Copyright The Prometheus Authors
+```
+
+Simple sed script to help automate updates:
+
+```
+find . -type f \( -iname '*.go' -or -iname Makefile \) \
+  \( ! -path './vendor/*' -and ! -path '*/node_modules/*' \) \
+  | xargs sed -i -E '1s/^(\/\/|#) Copyright .*/\1 Copyright The Prometheus Authors/'
+```