Fix container resource sampling and surface collection failures

agent/ec_agent.py

@@ -32,7 +32,7 @@ import urllib.parse
 import urllib.request
 import uuid
 
-VERSION = "1.4.5"
+VERSION = "1.4.6"
 LABEL = "io.electric-cherry"
 MAX_FILE = 32 * 1024 * 1024
 LIBRARY_DOWNLOAD_WORKERS = 4
@@ -933,7 +933,7 @@ class Agent:
 
     def instance_resources(self):
         """One bounded Docker stats batch; unavailable samples are never zero load."""
-        ids = self.docker.call("container", "ls", "--filter", LABEL + ".managed=true",
+        ids = self.docker.call("container", "ls", "--filter", "label=" + LABEL + ".managed=true",
                                "--no-trunc", "--format", "{{.ID}}", timeout=10).splitlines()[:1000]
         if not ids:
             return []
@@ -1084,8 +1084,10 @@ class Agent:
                         images.extend(alias for alias, image_id in json.loads(aliases.read_text()).items() if image_id in image_ids)
         resources = {}
         if docker_running:
-            with contextlib.suppress(AgentError, ValueError, TypeError, KeyError):
+            try:
                 resources["instanceResources"] = self.instance_resources()
+            except (AgentError, ValueError, TypeError, KeyError):
+                resources["instanceResourcesError"] = "Container resource sampling failed. Check Docker access and stats availability on this host."
         os_name = platform.system()
         with contextlib.suppress(OSError):
             for line in Path("/etc/os-release").read_text().splitlines():