DNSSEC sign metrics: CHANGES, doc, release note

Add some information about the new statistic-channel DNS sign
metrics. Also add a CHANGES and release note entry.
47 jobs for !2067 with 513-matthijs-dnssec-sign-stats in 11 minutes and 47 seconds (queued for 4 seconds)
detached
Status Job ID Name Coverage
  Precheck
passed #258737
amd64 linux
🐞:sid:amd64

00:00:13

passed #258734
amd64 linux
autoconf

00:00:34

passed #258735
amd64 linux
autoreconf:sid:amd64

00:00:34

passed #258736
amd64 linux
misc:sid:amd64

00:00:18

 
  Build
passed #258748
amd64 linux
asan:sid:amd64

00:02:57

passed #258750
amd64 linux
clang:stretch:amd64

00:01:38

passed #258751
i386 linux
clang:stretch:i386

00:01:41

passed #258738
amd64 linux
docs:sid:amd64

00:01:00

passed #258747
amd64 linux
gcc:bionic:amd64

00:02:13

passed #258739
amd64 linux
gcc:centos6:amd64

00:02:09

passed #258740
amd64 linux
gcc:centos7:amd64

00:02:17

passed #258745
amd64 linux
gcc:fedora29:amd64

00:03:02

passed #258741
amd64 linux
gcc:jessie:amd64

00:01:19

passed #258743
amd64 linux
gcc:sid:amd64

00:01:35

passed #258744
i386 linux
gcc:sid:i386

00:02:07

passed #258742
amd64 linux
gcc:stretch:amd64

00:02:22

passed #258746
amd64 linux
gcc:xenial:amd64

00:02:17

passed #258753
amd64 linux
nolibtool:sid:amd64

00:01:55

passed #258752
amd64 linux
pkcs11:sid:amd64

00:02:22

passed #258749
amd64 linux
rwlock:sid:amd64

00:02:19

 
  Test
passed #258772
amd64 linux
system:asan:sid:amd64

00:08:05

passed #258770
amd64 linux
system:gcc:bionic:amd64

00:06:29

passed #258754
amd64 linux
system:gcc:centos6:amd64

00:06:23

passed #258756
amd64 linux
system:gcc:centos7:amd64

00:06:20

passed #258766
amd64 linux
system:gcc:fedora29:amd64

00:06:51

passed #258758
amd64 linux
system:gcc:jessie:amd64

00:06:26

passed #258762
amd64 linux
system:gcc:sid:amd64

00:07:00

passed #258764
i386 linux
system:gcc:sid:i386

00:07:08

passed #258760
amd64 linux
system:gcc:stretch:amd64

00:06:49

passed #258768
amd64 linux
system:gcc:xenial:amd64

00:06:43

passed #258779
amd64 linux
system:nolibtool:sid:amd64

00:06:53

passed #258777
amd64 linux
system:pkcs11:sid:amd64

00:06:56

passed #258774
amd64 linux
system:rwlock:sid:amd64

00:06:57

passed #258773
amd64 linux
unit:asan:sid:amd64

00:01:15

passed #258776
amd64 linux
unit:clang:stretch:amd64

00:00:43

passed #258771
amd64 linux
unit:gcc:bionic:amd64

00:00:57

passed #258755
amd64 linux
unit:gcc:centos6:amd64

00:00:49

passed #258757
amd64 linux
unit:gcc:centos7:amd64

00:00:52

passed #258767
amd64 linux
unit:gcc:fedora29:amd64

00:00:49

passed #258759
amd64 linux
unit:gcc:jessie:amd64

00:00:33

passed #258763
amd64 linux
unit:gcc:sid:amd64

00:00:59

passed #258765
i386 linux
unit:gcc:sid:i386

00:00:58

passed #258761
amd64 linux
unit:gcc:stretch:amd64

00:00:58

passed #258769
amd64 linux
unit:gcc:xenial:amd64

00:01:04

passed #258780
amd64 linux
unit:nolibtool:sid:amd64

00:01:05

passed #258778
amd64 linux
unit:pkcs11:sid:amd64

00:00:44

passed #258775
amd64 linux
unit:rwlock:sid:amd64

00:01:00