suppress systemd-run error(Connection reset by peer) while validating…

… ext cgroups (#3278)

* ignore systemd error

* addressed comment

tests_e2e/tests/lib/cgroup_helpers.py

@@ -144,12 +144,18 @@ def check_agent_quota_disabled():
     # Ubuntu 16 has an issue in expressing no quota as "infinity" https://github.com/systemd/systemd/issues/5965, so we are directly checking the quota value in cpu controller
     return cpu_quota == 'infinity' or get_unit_cgroup_cpu_quota_disabled(AGENT_SERVICE_NAME)
 
-def check_cgroup_disabled_with_unknown_process():
+def check_cgroup_disabled_due_to_systemd_error():
     """
-    Returns True if the cgroup is disabled with unknown process
-    """
-    return check_log_message("Disabling resource usage monitoring. Reason: Check on cgroups failed:.+UNKNOWN")
+    Returns True if the cgroup is disabled due to systemd error (Connection reset by peer)
+
+    Ex:
+    2024-12-18T06:43:23.867711Z INFO ExtHandler ExtHandler [CGW] Disabling resource usage monitoring. Reason: Failed to start Microsoft.Azure.Extensions.Edp.GATestExtGo-1.2.0.0 using systemd-run, will try invoking the extension directly. Error: [SystemdRunError] Systemd process exited with code 1 and output [stdout]
 
+    [stderr]
+    Warning! D-Bus connection terminated.
+    Failed to start transient scope unit: Connection reset by peer
+    """
+    return check_log_message("Failed to start.+using systemd-run, will try invoking the extension directly.+[SystemdRunError].+Connection reset by peer")
 
 def check_log_message(message, after_timestamp=datetime.datetime.min):
     """

tests_e2e/tests/scripts/ext_cgroups-check_cgroups_extensions.py

@@ -25,7 +25,7 @@
 from tests_e2e.tests.lib.cgroup_helpers import verify_if_distro_supports_cgroup, \
     verify_agent_cgroup_assigned_correctly, BASE_CGROUP, EXT_CONTROLLERS, get_unit_cgroup_mount_path, \
     GATESTEXT_SERVICE, AZUREMONITORAGENT_SERVICE, check_agent_quota_disabled, \
-    check_cgroup_disabled_with_unknown_process, CGROUP_TRACKED_PATTERN, AZUREMONITOREXT_FULL_NAME, GATESTEXT_FULL_NAME, \
+    check_cgroup_disabled_due_to_systemd_error, CGROUP_TRACKED_PATTERN, AZUREMONITOREXT_FULL_NAME, GATESTEXT_FULL_NAME, \
     print_cgroups
 from tests_e2e.tests.lib.logging import log
 from tests_e2e.tests.lib.retry import retry_if_false
@@ -213,8 +213,8 @@ def main():
 try:
     main()
 except Exception as e:
-    # It is possible that  agent cgroup can be disabled due to UNKNOWN process or throttled before we run this check, in that case, we should ignore the validation
-    if check_cgroup_disabled_with_unknown_process() and retry_if_false(check_agent_quota_disabled):
-        log.info("Cgroup is disabled due to UNKNOWN process, ignoring ext cgroups validations")
+    # It is possible that agent cgroup can be disabled and reset the quotas if the extension failed to start using systemd-run. In that case, we should ignore the validation
+    if check_cgroup_disabled_due_to_systemd_error() and retry_if_false(check_agent_quota_disabled):
+        log.info("Cgroup is disabled due to systemd error while invoking the extension, ignoring ext cgroups validations")
     else:
         raise