Fix plugin sync issues (#4930)

# What this PR does
- Fix incorrect response for error message on sync
- Remove sleep delay from sync (natural latency provides enough delay)

## Which issue(s) this PR closes

Related to [issue link here]

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## Checklist

- [ ] Unit, integration, and e2e (if applicable) tests updated
- [ ] Documentation added (or `pr:no public docs` PR label added if not
required)
- [ ] Added the relevant release notes label (see labels prefixed w/
`release:`). These labels dictate how your PR will
    show up in the autogenerated release notes.

engine/apps/grafana_plugin/tasks/sync_v2.py

@@ -1,6 +1,4 @@
 import logging
-import math
-from time import sleep
 
 from celery.utils.log import get_task_logger
 from django.utils import timezone
@@ -38,8 +36,7 @@ def sync_organizations_v2(org_ids=None):
                     logger.debug(f"Found {len(active_instance_ids)} active instances")
                     organization_qs = organization_qs.filter(stack_id__in=active_instance_ids)
 
-            orgs_per_second = math.ceil(len(organization_qs) / SYNC_PERIOD.seconds)
-            logger.info(f"Syncing {len(organization_qs)} organizations @ {orgs_per_second} per 1s pause")
+            logger.info(f"Syncing {len(organization_qs)} organizations")
             for idx, org in enumerate(organization_qs):
                 if GrafanaAPIClient.validate_grafana_token_format(org.api_token):
                     client = GrafanaAPIClient(api_url=org.grafana_url, api_token=org.api_token)
@@ -48,9 +45,8 @@ def sync_organizations_v2(org_ids=None):
                         logger.error(
                             f"Failed to request sync stack_slug={org.stack_slug} status_code={status['status_code']} url={status['url']} message={status['message']}"
                         )
-                    if idx % orgs_per_second == 0:
-                        logger.info(f"Sleep 1s after {idx + 1} organizations processed")
-                        sleep(1)
+                    if idx % 1000 == 0:
+                        logger.info(f"{idx + 1} organizations processed")
                 else:
                     logger.info(f"Skipping stack_slug={org.stack_slug}, api_token format is invalid or not set")
         else:

engine/apps/grafana_plugin/views/sync_v2.py

@@ -1,5 +1,5 @@
 import logging
-from dataclasses import asdict
+from dataclasses import asdict, is_dataclass
 
 from django.conf import settings
 from rest_framework import status
@@ -49,6 +49,9 @@ def post(self, request: Request) -> Response:
         try:
             self.do_sync(request)
         except SyncException as e:
-            return Response(data=asdict(e.error_data), status=status.HTTP_400_BAD_REQUEST)
+            return Response(
+                data=asdict(e.error_data) if is_dataclass(e.error_data) else e.error_data,
+                status=status.HTTP_400_BAD_REQUEST,
+            )
 
         return Response(status=status.HTTP_200_OK)