Ceph

During the last 24 hours, I saw two crashes which I have never seen before v18.2.1

{
    "backtrace": [
        "  File \"/usr/share/ceph/mgr/orchestrator/_interface.py\", line 1657, in _oremote\n    return mgr.remote(o, meth, *args, **kwargs)",
        "  File \"/usr/share/ceph/mgr/mgr_module.py\", line 2228, in remote\n    args, kwargs)",
        "ImportError: Module not found",
        "\nDuring handling of the above exception, another exception occurred:\n",
        "Traceback (most recent call last):",
        "  File \"/usr/share/ceph/mgr/prometheus/module.py\", line 649, in __init__\n    self.modify_instance_id = self.get_orch_status() and self.get_module_option(",
        "  File \"/usr/share/ceph/mgr/prometheus/module.py\", line 869, in get_orch_status\n    return self.available()[0]",
        "  File \"/usr/share/ceph/mgr/orchestrator/_interface.py\", line 1586, in inner\n    completion = self._oremote(method_name, args, kwargs)",
        "  File \"/usr/share/ceph/mgr/orchestrator/_interface.py\", line 1661, in _oremote\n    f_set = self.get_feature_set()",
        "  File \"/usr/share/ceph/mgr/orchestrator/_interface.py\", line 1586, in inner\n    completion = self._oremote(method_name, args, kwargs)",
        "  File \"/usr/share/ceph/mgr/orchestrator/_interface.py\", line 1657, in _oremote\n    return mgr.remote(o, meth, *args, **kwargs)",
        "  File \"/usr/share/ceph/mgr/mgr_module.py\", line 2228, in remote\n    args, kwargs)",
        "ImportError: Module not found" 
    ],
    "ceph_version": "18.2.1",
    "crash_id": "2023-12-20T16:36:51.332655Z_6a5b8eb6-6e91-4fc3-980c-3f21775c14e5",
    "entity_name": "mgr.b",
    "mgr_module": "prometheus",
    "mgr_module_caller": "ActivePyModule::load",
    "mgr_python_exception": "ImportError",
    "os_id": "centos",
    "os_name": "CentOS Stream",
    "os_version": "8",
    "os_version_id": "8",
    "process_name": "ceph-mgr",
    "stack_sig": "6f4033c8739c625d3935380854c7945f8bd28267f6a4d03fc2017bc8815c257c",
    "timestamp": "2023-12-20T16:36:51.332655Z",
    "utsname_hostname": "tc1-h3",
    "utsname_machine": "x86_64",
    "utsname_release": "5.14.0-284.30.1.el9_2.x86_64",
    "utsname_sysname": "Linux",
    "utsname_version": "#1 SMP PREEMPT_DYNAMIC Tue Sep 12 09:28:32 EDT 2023" 
}