perf: build info log messages lazily so raising the log level actually saves work (#27837)

Raising GLOBAL_LOG_LEVEL to WARNING buys quieter output but not less work: 241 INFO call sites interpolate their payload into an f-string before the logging call gets to drop it. The heaviest is get_doc, which logs every chunk id and metadata dict in a collection, so on the full-context retrieval path that is the entire knowledge base, once per chat request.

That one line at WARNING, CPython 3.12:

| knowledge base | payload | before   | after   |
| -------------- | ------- | -------- | ------- |
| top-k of 3     | 1.2 kB  | 3.8 us   | 0.07 us |
| 500 chunks     | 201 kB  | 583.6 us | 0.08 us |
| 5000 chunks    | 2.0 MB  | 5.8 ms   | 0.15 us |

The lazy form log.info('query_doc:result %s %s', result.ids, result.metadatas) hands the payload to record.getMessage(), which the InterceptHandler only reaches once a record has passed the level check. Output at INFO is byte-identical. Two sites that already built their message eagerly, one str concat and one % operator, move to the same lazy form.

backend/open_webui/retrieval/web/exa.py

@@ -31,7 +31,7 @@ def search_exa(
         count (int): Number of results to return
         filter_list (Optional[list[str]]): List of domains to filter results by
     """
-    log.info(f'Searching with Exa for query: {query}')
+    log.info('Searching with Exa for query: %s', query)
 
     headers = {'Authorization': f'Bearer {api_key}', 'Content-Type': 'application/json'}
 
@@ -58,7 +58,7 @@ def search_exa(
                 )
             )
 
-        log.info(f'Found {len(results)} results')
+        log.info('Found %s results', len(results))
         return [
             SearchResult(
                 link=result.url,

backend/open_webui/retrieval/web/external.py

@@ -53,7 +53,7 @@ def search_external(
             )
             for result in results[:count]
         ]
-        log.info(f'External search results: {results}')
+        log.info('External search results: %s', results)
         return results
     except Exception as e:
         log.error(f'Error in External search: {e}')

backend/open_webui/retrieval/web/firecrawl.py

@@ -225,7 +225,7 @@ def search_firecrawl(
                 )
             )
 
-        log.info(f'FireCrawl search results: {search_results}')
+        log.info('FireCrawl search results: %s', search_results)
         return search_results
     except Exception as e:
         log.error(f'Error in FireCrawl search: {e}')

backend/open_webui/retrieval/web/ollama.py

@@ -23,7 +23,7 @@ def search_ollama_cloud(
         count (int): Number of results to return
         filter_list (Optional[list[str]]): List of domains to filter results by
     """
-    log.info(f'Searching with Ollama for query: {query}')
+    log.info('Searching with Ollama for query: %s', query)
 
     headers = {'Authorization': f'Bearer {api_key}', 'Content-Type': 'application/json'}
     payload = {'query': query, 'max_results': count}
@@ -34,7 +34,7 @@ def search_ollama_cloud(
         data = response.json()
 
         results = data.get('results', [])
-        log.info(f'Found {len(results)} results')
+        log.info('Found %s results', len(results))
 
         if filter_list:
             results = get_filtered_results(results, filter_list)

backend/open_webui/retrieval/web/searchapi.py

@@ -31,7 +31,7 @@ def search_searchapi(
     response = requests.request('GET', url)
 
     json_response = response.json()
-    log.info(f'results from searchapi search: {json_response}')
+    log.info('results from searchapi search: %s', json_response)
 
     results = sorted(json_response.get('organic_results', []), key=lambda x: x.get('position', 0))
     if filter_list:

backend/open_webui/retrieval/web/serpapi.py

@@ -31,7 +31,7 @@ def search_serpapi(
     response = requests.request('GET', url)
 
     json_response = response.json()
-    log.info(f'results from serpapi search: {json_response}')
+    log.info('results from serpapi search: %s', json_response)
 
     results = sorted(json_response.get('organic_results', []), key=lambda x: x.get('position', 0))
     if filter_list:

backend/open_webui/retrieval/web/serply.py

@@ -51,7 +51,7 @@ def search_serply(
     response.raise_for_status()
 
     json_response = response.json()
-    log.info(f'results from serply search: {json_response}')
+    log.info('results from serply search: %s', json_response)
 
     results = sorted(json_response.get('results', []), key=lambda x: x.get('realPosition', 0))
     if filter_list:

backend/open_webui/retrieval/web/yandex.py

@@ -112,7 +112,7 @@ def search_yandex(
             for result in results[:count]
         ]
 
-        log.info(f'Yandex search results: {results}')
+        log.info('Yandex search results: %s', results)
 
         return results
     except Exception as e: