connectivity: Add "Link not found" in the exception list

This "Link not found" message shows up frequently, causing the
connectivity test to fail. Add the message to the error / warning log
exceptions until #1894 is resolved.

Signed-off-by: Michi Mutsuzaki <michi@isovalent.com>

connectivity/tests/errors.go

@@ -26,10 +26,18 @@ import (
 func NoErrorsInLogs(ciliumVersion semver.Version) check.Scenario {
 	// Exceptions for level=error should only be added as a last resort, if the
 	// error cannot be fixed in Cilium or in the test.
-	errorLogExceptions := []string{"Error in delegate stream, restarting", failedToListCRDs, removeInexistentID}
+	errorLogExceptions := []string{
+		"Error in delegate stream, restarting",
+		failedToListCRDs,
+		removeInexistentID,
+		linkNotFound,
+	}
 	if ciliumVersion.LT(semver.MustParse("1.14.0")) {
 		errorLogExceptions = append(errorLogExceptions, previouslyUsedCIDR)
 	}
+	warningLogExceptions := []string{
+		linkNotFound,
+	}
 	// The list is adopted from cilium/cilium/test/helper/utils.go
 	var errorMsgsWithExceptions = map[string][]string{
 		panicMessage:        nil,
@@ -53,6 +61,7 @@ func NoErrorsInLogs(ciliumVersion semver.Version) check.Scenario {
 		emptyIPNodeIDAlloc:  nil,
 		"DATA RACE":         nil,
 		"level=error":       errorLogExceptions,
+		"level=warning":     warningLogExceptions,
 	}
 	return &noErrorsInLogs{errorMsgsWithExceptions}
 }
@@ -245,4 +254,5 @@ const (
 	emptyIPNodeIDAlloc  = "Attempt to allocate a node ID for an empty node IP address"
 	failedToListCRDs    = "the server could not find the requested resource" // cf. https://github.com/cilium/cilium/issues/16425
 	previouslyUsedCIDR  = "Unable to find identity of previously used CIDR"  // from https://github.com/cilium/cilium/issues/26881
+	linkNotFound        = "Link not found"                                   // https://github.com/cilium/cilium-cli/issues/1894
 )