Possibly related to jessie vs. stretch
Mostly it's just the normal package not found error for the nutcracker exporter, but take a look at this one from -redis06 trying to get the redis one:
Error: Execution of '/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold install prometheus-redis-exporter' returned 100: Reading package lists... Building dependency tree... Reading state information... The following packages were automatically installed and are no longer required: apt-file insserv libexporter-tiny-perl liblist-moreutils-perl libpcsclite1 libregexp-assemble-perl python-gdbm startpar sysv-rc Use 'sudo apt autoremove' to remove them. The following NEW packages will be installed: prometheus-redis-exporter 0 upgraded, 1 newly installed, 0 to remove and 50 not upgraded. Need to get 1359 kB of archives. After this operation, 4849 kB of additional disk space will be used. Err:1 http://apt.wikimedia.org/wikimedia stretch-wikimedia/main amd64 prometheus-redis-exporter amd64 0.12.2-1 404 Not Found [IP: 208.80.154.22 80] E: Failed to fetch http://apt.wikimedia.org/wikimedia/pool/main/p/prometheus-redis-exporter/prometheus-redis-exporter_0.12.2-1_amd64.deb 404 Not Found [IP: 208.80.154.22 80] E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Is something wrong on the apt.wikimedia.org side there?