backports is only available for Debian stable and oldstable and Debian stretch will move to LTS state in about a week. Packages which we were using from stretch-backports need to be migrate to components on apt.wikimedia.org.
[] Stretch Docker base image
[x] librdkafka1 - eventlogging
[] osm2pgsql - osm
[x] analytics - git-lfs
[x] python3-prometheus-client-package - prometheus
[x] systemd, systemd-sysv, udev, libsystemd0, libpam-systemd - systemd
[x] npm - testreduce
[x] libhwloc5 - trafficserver
[x] librdkafka1 - varnishkafka
[x] graphite-web - graphite
[] npm - testreduce
Non exhaustive list for CI (at least)
[] golang-1.11-go - CI tox-acme-chef image T257456
[] golang-1.11-go - `docker-registry.wikimedia.org/golang:1.11` which is based on Stretch
[x] git 2.20.1 - #git-protocol-v2 for CI and scap at least. T257308
These are handled via T256881
* 'librados2', 'librgw2', 'librbd1', 'python-rados', 'python-rbd', 'ceph-common', 'python-cephfs', 'libradosstriper1' - openstack/queens&rocky