Maybe it is this as Grant (orndorffgrant) mentioned earlier?

| APT::Periodic::Download-Upgradeable-Packages "0";

During the time of a surge, we saw this:

| Hits      h%  Vis.     v%   Bandwidth Mtd  Proto    Data
| ----- ------ ----- ------ ----------- ---- -------- ----
| 3772   0.82%  2461  0.85%   56.62 GiB GET  HTTP/1.1 
/infra/ubuntu/pool/main/l/linux-azure-5.4/linux-modules-extra-5.4.0-1116-azure_5.4.0-1116.123~18.04.1_amd64.deb
| 3246   0.71%  2147  0.74%   41.55 GiB GET  HTTP/1.1 
/infra/ubuntu/pool/main/l/linux-azure-5.4/linux-modules-5.4.0-1116-azure_5.4.0-1116.123~18.04.1_amd64.deb
| 3850   0.84%  2585  0.89%   41.15 GiB GET  HTTP/1.1 
/infra/ubuntu/pool/main/l/linux-azure-5.4/linux-azure-5.4-headers-5.4.0-1116_5.4.0-1116.123~18.04.1_all.deb
| 3580   0.78%  2364  0.81%   32.93 GiB GET  HTTP/1.1 
/infra/ubuntu/pool/main/l/linux-signed-azure-5.4/linux-image-5.4.0-1116-azure_5.4.0-1116.123~18.04.1_amd64.deb
| 3607   0.78%  2478  0.85%   18.01 GiB GET  HTTP/1.1 
/infra/ubuntu/pool/main/l/linux-azure-5.4/linux-azure-5.4-tools-5.4.0-1116_5.4.0-1116.123~18.04.1_amd64.deb
| 3523   0.77%  2413  0.83%    5.33 GiB GET  HTTP/1.1 
/infra/ubuntu/pool/main/l/linux-azure-5.4/linux-headers-5.4.0-1116-azure_5.4.0-1116.123~18.04.1_amd64.deb
| 3635   0.79%  2510  0.86%    2.00 GiB GET  HTTP/1.1 
/infra/ubuntu/pool/main/l/linux-azure-5.4/linux-azure-5.4-cloud-tools-5.4.0-1116_5.4.0-1116.123~18.04.1_amd64.deb
| 3604   0.78%  2508  0.86%    1.93 GiB GET  HTTP/1.1 
/infra/ubuntu/pool/main/l/linux-azure-5.4/linux-cloud-tools-5.4.0-1116-azure_5.4.0-1116.123~18.04.1_amd64.deb
| 3431   0.75%  2421  0.83%    1.83 GiB GET  HTTP/1.1 
/infra/ubuntu/pool/main/l/linux-azure-5.4/linux-tools-5.4.0-1116-azure_5.4.0-1116.123~18.04.1_amd64.deb

This kernel would be for Bionic VMs in Azure - as Junien (axino) has
pointed out earlier.

`APT::Periodic::Download-Upgradeable-Packages` is defined in
`/etc/apt/apt.conf.d/10periodic` and shipped out via `update-notifier-
common`.


** Also affects: update-notifier (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2034656

Title:
  ESM archive getting DoSed with legitimate traffic every day at 06:25
  (cron.daily time)

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