In 5.15 Jammy kernel the config is still there:
CONFIG_SENSORS_ADM1021                          policy<{'amd64': 'm', 'arm64': 
'm', 'armhf': 'm', 'ppc64el': 'm'}>

In Noble kernel 6.8 which is hwe-6.8 in Jammy the config is removed by:
583e57ba05b7 UBUNTU: [Config] update configs and annotations after rebase to 
6.0-rc1
-CONFIG_SENSORS_ADM1021                          policy<{'amd64': 'm', 'arm64': 
'm', 'armhf': 'm', 'ppc64el': 'm', 'riscv64': 'm', 's390x': '-'}>

Are you using 6.8 kernel?

>From kernel git log, I don't see much reason to remove this.

** Changed in: linux (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/2074357

Title:
  CONFIG_SENSORS_ADM1021 missing from 22.04. on

Status in linux package in Ubuntu:
  Triaged

Bug description:
  It seems that the adm1021 driver module was dropped from the kernel
  config (CONFIG_SENSORS_ADM1021=m) starting from Ubuntu 22.04.

  There are several Siemens devices that use this chip for temperature
  monitoring, and many of these devices rely on Debian. An absence of
  the driver is an issue for us that has to be fixed downstream at the
  moment.

  Is it possible to re-add the config switch?

  Was the omission of the ADM1021 driver part of a regular cleanup
  process, or is there some technical reasons behind this decision?

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