cephadm: expose gather-facts api method

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

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

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

src/pybind/mgr/cephadm/module.py

@@ -1490,6 +1490,21 @@ def get_hosts(self):
         """
         return list(self.inventory.all_specs())
 
+    @handle_orch_error
+    def get_gather_facts(self, hostname: Optional[str] = None) -> List[Dict[str, Any]]:
+        """
+        Return a list of hosts metadata(gather_facts) managed by the orchestrator.
+
+        Notes:
+          - skip async: manager reads from cache.
+        """
+        if hostname:
+            return [self.cache.get_facts(hostname)]
+        gather_facts = []
+        for h in self.cache.get_hosts():
+            gather_facts.append(self.cache.get_facts(h))
+        return gather_facts
+
     @handle_orch_error
     def add_host_label(self, host: str, label: str) -> str:
         self.inventory.add_label(host, label)

src/pybind/mgr/dashboard/services/orchestrator.py

@@ -62,6 +62,10 @@ def get(self, hostname: str) -> Optional[HostSpec]:
         hosts = [host for host in self.list() if host.hostname == hostname]
         return hosts[0] if hosts else None
 
+    @wait_api_result
+    def gather_facts(self, hostname: Optional[str] = None) -> List[Dict[str, Any]]:
+        return self.api.get_gather_facts(hostname)
+
     @wait_api_result
     def add(self, hostname: str, addr: str, labels: List[str], status: str):
         return self.api.add_host(HostSpec(hostname, addr=addr, labels=labels, status=status))

src/pybind/mgr/orchestrator/_interface.py

@@ -368,6 +368,12 @@ def get_hosts(self) -> OrchResult[List[HostSpec]]:
         """
         raise NotImplementedError()
 
+    def get_gather_facts(self, hostname: Optional[str] = None) -> OrchResult[List[Dict[str, Any]]]:
+        """
+        Return hosts metadata(gather_facts).
+        """
+        raise NotImplementedError()
+
     def add_host_label(self, host: str, label: str) -> OrchResult[str]:
         """
         Add a host label