When the distibution reaches end-of-life, it enters grace period of 3 months when the support is considered deprecated. After that period, the product is considered unsupported. Any support may only be available on the best-effort basis.

Table 1. Clients approaching end-of-life and end of support
Operating System Architecture End-of-life date End of support

Debian 9

x86-64, aarch64, armv7l, i586

2022-06-30

2022-09-30

For more information about end-of-life dates, see https://endoflife.software/operating-systems.