diff --git a/command/command.go b/command/command.go
index 33d9192c3..6cd330655 100644
--- a/command/command.go
+++ b/command/command.go
@@ -415,10 +415,13 @@ func runChecker(checker *checks.Checker, checkReportCh chan *checks.Report, repo
 			if checker.Config.Action != nil {
 				env := []string{fmt.Sprintf("MACKEREL_STATUS=%s", report.Status), fmt.Sprintf("MACKEREL_PREVIOUS_STATUS=%s", lastStatus)}
 				go func() {
-					_, stderr, _, _ := checker.Config.Action.RunWithEnv(env)
+					logger.Debugf("Checker %q action: %q env: %+v", checker.Name, checker.Config.Action.CommandString(), env)
+					stdout, stderr, exitCode, _ := checker.Config.Action.RunWithEnv(env)
 
 					if stderr != "" {
-						logger.Warningf("Checker %q action output stderr: %s", checker.Name, stderr)
+						logger.Warningf("Checker %q action stdout: %q stderr: %q exitCode: %d", checker.Name, stdout, stderr, exitCode)
+					} else {
+						logger.Debugf("Checker %q action stdout: %q exitCode: %d", checker.Name, stdout, exitCode)
 					}
 				}()
 			}