cephadm:expose gather-facts orch api

Fixes: https://tracker.ceph.com/issues/51209

This PR intends to expose host metadata(gather-facts) orch api

Signed-off-by: Avan Thakkar <athakkar@redhat.com>
Signed-off-by: Aashish Sharma <aasharma@redhat.com>

src/pybind/mgr/cephadm/module.py

@@ -1490,6 +1490,24 @@ def get_hosts(self):
         """
         return list(self.inventory.all_specs())
 
+    @handle_orch_error
+    @forall_hosts
+    def get_gather_facts(self, hostname:str):
+        # type: (str) -> List[str]
+        """
+        Return a list of host metadata managed by the orchestrator.
+
+        Notes:
+          - skip async: manager reads from cache.
+        """
+        out, err, code = CephadmServe(self)._run_cephadm(hostname, cephadmNoImage, "gather-facts",
+                                                                error_ok=True)
+
+        if code:
+            raise OrchestratorError('Gather facts failed: %s' % '\n'.join(out + err))
+
+        return json.loads(out)
+
     @handle_orch_error
     def add_host_label(self, host: str, label: str) -> str:
         self.inventory.add_label(host, label)

src/pybind/mgr/orchestrator/module.py

@@ -380,6 +380,13 @@ def _get_hosts(self, format: Format = Format.plain) -> HandleCommandResult:
             output = table.get_string()
         return HandleCommandResult(stdout=output)
 
+    @_cli_read_command('orch host gather facts')
+    def _get_hosts_gather_facts(self, hostname) -> HandleCommandResult:
+        """List hosts metadata"""
+        completion = self.get_gather_facts(hostname)
+        raise_if_exception(completion)
+        return HandleCommandResult(stdout=completion.result_str())
+
     @_cli_write_command('orch host label add')
     def _host_label_add(self, hostname: str, label: str) -> HandleCommandResult:
         """Add a host label"""