plugin/pkg/uniq: add (#1733)

Spin this out the metrics package so we can use it in the health
one of well to fix some reload bugs.

1 files changed, 0 insertions, 52 deletions

diff --git a/plugin/metrics/addr.go b/plugin/metrics/addr.go
deleted file mode 100644
index fe8e5e5fe..000000000
--- a/plugin/metrics/addr.go
+++ /dev/null
@@ -1,52 +0,0 @@
-package metrics
-
-// addrs keeps track on which addrs we listen, so we only start one listener, is
-// prometheus is used in multiple Server Blocks.
-type addrs struct {
-	a map[string]value
-}
-
-type value struct {
-	state int
-	f     func() error
-}
-
-var uniqAddr addrs
-
-func newAddress() addrs {
-	return addrs{a: make(map[string]value)}
-}
-
-func (a addrs) setAddress(addr string, f func() error) {
-	if a.a[addr].state == done {
-		return
-	}
-	a.a[addr] = value{todo, f}
-}
-
-// setAddressTodo sets addr to 'todo' again.
-func (a addrs) setAddressTodo(addr string) {
-	v, ok := a.a[addr]
-	if !ok {
-		return
-	}
-	v.state = todo
-	a.a[addr] = v
-}
-
-// forEachTodo iterates for a and executes f for each element that is 'todo' and sets it to 'done'.
-func (a addrs) forEachTodo() error {
-	for k, v := range a.a {
-		if v.state == todo {
-			v.f()
-		}
-		v.state = done
-		a.a[k] = v
-	}
-	return nil
-}
-
-const (
-	todo = 1
-	done = 2
-)