constant kernel version in xenial

[Raiman, Timor]

Hello,
We need to configure a pool of machines to use the exact same kernel version.
We found that some kernels appear in the Ubuntu repositories and then are removed when a newer package is available (eg, 4.4.0.24.25 is not available since 4.4.0.28.30 was uploaded).

Can we rely on certain kernel versions to remain available in the repositories for a significant length of time?

For example, I see that 4.4.0.21.22 has been available for a while (18 Apr 2016)

Thanks!

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