Ensure HM updates work as expected

This patch ensures if only one parameter is provided the
rest are not modified (set to undefined)

Closes-Bug: #1997416
Change-Id: Ie47f19afdd041843fe47da739b09ee03a88c7b02

ovn_octavia_provider/helper.py

@@ -2472,11 +2472,15 @@ class OvnProviderHelper():
                 LOG.debug("Could not find LB with pool id %s", pool_id)
                 return status
 
-        options = {
-            'interval': str(info['interval']),
-            'timeout': str(info['timeout']),
-            'success_count': str(info['success_count']),
-            'failure_count': str(info['failure_count'])}
+        options = {}
+        if info['interval']:
+            options['interval'] = str(info['interval'])
+        if info['timeout']:
+            options['timeout'] = str(info['timeout'])
+        if info['success_count']:
+            options['success_count'] = str(info['success_count'])
+        if info['failure_count']:
+            options['failure_count'] = str(info['failure_count'])
 
         commands = []
         commands.append(

ovn_octavia_provider/tests/unit/test_helper.py

@@ -3675,6 +3675,21 @@ class TestOvnProviderHelper(ovn_base.TestOvnOctaviaBase):
         self.assertEqual(status['healthmonitors'][0]['operating_status'],
                          constants.ERROR)
 
+    @mock.patch.object(ovn_helper.OvnProviderHelper, '_find_ovn_lb_from_hm_id')
+    def test_hm_update_just_interval(self, folbfhi):
+        folbfhi.return_value = (self.ovn_hm, self.ovn_hm_lb)
+        self.health_monitor['interval'] = 3
+        self.helper.hm_update(self.health_monitor)
+        options = {
+            'interval': str(self.health_monitor['interval']),
+            'timeout': str(self.health_monitor['timeout']),
+            'success_count': str(self.health_monitor['success_count']),
+            'failure_count': str(self.health_monitor['failure_count'])}
+        self.helper.ovn_nbdb_api.db_set.assert_called_once_with(
+            'Load_Balancer_Health_Check',
+            self.ovn_hm.uuid,
+            ('options', options))
+
     def test_hm_delete(self):
         self.helper.ovn_nbdb_api.db_list_rows.return_value.\
             execute.return_value = [self.ovn_hm]