improve output format of check_docker

check_docker.sh

@@ -63,11 +63,11 @@ mem_scale=";${mem_threshold_warning};${mem_threshold_critical};0;100"
 
 # Running containers.
 for container in ${running_containers}; do
-    output+=" OK: ${container} status is running"
+    output+="OK: ${container} status is running\n"
 done
 # Not running containers.
 for container in ${not_running_containers}; do
-    output+=" NOK: ${container} status is not running"
+    output+="NOK: ${container} status is not running\n"
 done
 
 # CPU and memory statistics for running containers.
@@ -80,12 +80,12 @@ for container_stats in ${running_containers_stats}; do
     status='OK'
     [[ ${cpu%.*} -ge $cpu_threshold_warning ]] && status='WARNING'
     [[ ${cpu%.*} -ge $cpu_threshold_critical ]] && status='CRITICAL'
-    output+=" ${status}: ${name} cpu is ${cpu}%"
+    output+="${status}: ${name} cpu is ${cpu}%\n"
 
     status='OK'
     [[ ${mem%.*} -ge $mem_threshold_warning ]] && status='WARNING'
     [[ ${mem%.*} -ge $mem_threshold_critical ]] && status='CRITICAL'
-    output+=" ${status}: ${name} memory is ${mem}%"
+    output+="${status}: ${name} memory is ${mem}%\n"
 
     perf+="${name}_cpu=${cpu}%${cpu_scale} "
     perf+="${name}_mem=${mem}%${mem_scale} "
@@ -99,5 +99,5 @@ grep --quiet 'WARNING:' <(echo $output) && exit_code=1
 grep --quiet 'NOK:\|CRITICAL:' <(echo $output) && exit_code=2
 
 # Plugin output.
-echo "${output#' '}|${perf#' '}"
+echo "${output%'\n'}|${perf%' '}"
 exit $exit_code