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Description of problem:

Add a diag action similar to the one used with fence_ipmilan. This action should send an NMI, which can cause the system to panic and dump a vmcore if the kernel tunables are set appropriately.

Hopefully, this will only require adding `'diag': "Nmi"` to the action dict and adding "diag" to the device_opt list.

Reference:
  - http://redfish.dmtf.org/schemas/DSP2046_2020.3.html#redfish.dmtf.org/schemas/v1/ComputerSystem.json|details|ResetType

I do not have an environment with which to test fence_redfish.

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Version-Release number of selected component (if applicable):

fence-agents-redfish-4.2.1-53.el8_3.1

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How reproducible:

Always

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Steps to Reproduce:
1. Run `fence_redfish` with valid credentials and the `-o diag` option.

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Actual results:

2021-01-27 01:41:38,956 ERROR: Failed: Unrecognised action 'diag'

2021-01-27 01:41:38,957 ERROR: Please use '-h' for usage

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Expected results:

fence_redfish successfully sends an NMI to the target system.

ON_QA bug without Verified:Tested should be in the MODIFIED state.

Patch to add missing diag logic: https://github.com/ClusterLabs/fence-agents/pull/407

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (fence-agents bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4148