fix: Invalid image format log spam in Agent (#2894)

Backported-from: main (24.09)
Backported-to: 24.03
Backport-of: 2894

changes/2894.fix.md

@@ -0,0 +1 @@
+Fix invalid image format log spam in Agent

src/ai/backend/agent/docker/agent.py

@@ -1055,6 +1055,7 @@ class DockerAgent(AbstractAgent[DockerKernel, DockerKernelCreationContext]):
     metadata_server: MetadataServer
     docker_ptask_group: aiotools.PersistentTaskGroup
     gwbridge_subnet: Optional[str]
+    checked_invalid_images: Set[str]
 
     def __init__(
         self,
@@ -1074,6 +1075,7 @@ def __init__(
             skip_initial_scan=skip_initial_scan,
             agent_public_key=agent_public_key,
         )
+        self.checked_invalid_images = set()
 
     async def __ainit__(self) -> None:
         async with closing_async(Docker()) as docker:
@@ -1254,12 +1256,15 @@ async def scan_images(self) -> Mapping[str, str]:
                     if repo_tag.endswith("<none>"):
                         continue
                     try:
-                        ImageRef(repo_tag, ["*"])
-                    except ValueError:
-                        log.warning(
-                            "Image name {} does not conform to Backend.AI's image naming rule. This image will be ignored.",
-                            repo_tag,
-                        )
+                        ImageRef.parse_image_str(repo_tag, "*")
+                    except (InvalidImageName, InvalidImageTag) as e:
+                        if repo_tag not in self.checked_invalid_images:
+                            log.warning(
+                                "Image name {} does not conform to Backend.AI's image naming rule. This image will be ignored. Details: {}",
+                                repo_tag,
+                                e,
+                            )
+                            self.checked_invalid_images.add(repo_tag)
                         continue
 
                     img_detail = await docker.images.inspect(repo_tag)