fix(emqx): increase disk to 6GB and add optional MQ disable prompt

EMQX 6.1+ preallocates significant disk space for the MQ feature,
causing high CPU/disk usage on small containers (emqx/emqx#16649).

- Increase default disk from 4GB to 6GB
- Add read -rp prompt during install to optionally disable MQ feature
  via mq.enable=false in emqx.conf (reduces disk/CPU overhead)
- Setting is in install script (not CT script) per reviewer feedback

Co-authored-by: sim-san <sim-san@users.noreply.github.com>

ct/emqx.sh

@@ -9,7 +9,7 @@ APP="EMQX"
 var_tags="${var_tags:-mqtt}"
 var_cpu="${var_cpu:-2}"
 var_ram="${var_ram:-1024}"
-var_disk="${var_disk:-4}"
+var_disk="${var_disk:-6}"
 var_os="${var_os:-debian}"
 var_version="${var_version:-13}"
 var_unprivileged="${var_unprivileged:-1}"

frontend/public/json/emqx.json

@@ -21,7 +21,7 @@
       "resources": {
         "cpu": 2,
         "ram": 1024,
-        "hdd": 4,
+        "hdd": 6,
         "os": "debian",
         "version": "13"
       }

install/emqx-install.sh

@@ -38,6 +38,18 @@ rm -f "$DEB_FILE"
 echo "$LATEST_VERSION" >~/.emqx
 msg_ok "Installed EMQX"
 
+read -r -p "${TAB3}Would you like to disable the EMQX MQ feature? (reduces disk/CPU usage) <y/N> " prompt
+if [[ ${prompt,,} =~ ^(y|yes)$ ]]; then
+  msg_info "Disabling EMQX MQ feature"
+  mkdir -p /etc/emqx
+  if ! grep -q "^mq.enable" /etc/emqx/emqx.conf 2>/dev/null; then
+    echo "mq.enable = false" >>/etc/emqx/emqx.conf
+  else
+    sed -i 's/^mq.enable.*/mq.enable = false/' /etc/emqx/emqx.conf
+  fi
+  msg_ok "Disabled EMQX MQ feature"
+fi
+
 msg_info "Starting EMQX service"
 $STD systemctl enable -q --now emqx
 msg_ok "Enabled EMQX service"

misc/error_handler.func

@@ -243,18 +243,6 @@ error_handler() {
 # ------------------------------------------------------------------------------
 on_exit() {
   local exit_code=$?
-  # Report orphaned "installing" records to telemetry API
-  # Catches ALL exit paths: errors (non-zero), signals, AND clean exits where
-  # post_to_api was called ("installing" sent) but post_update_to_api was never called
-  if [[ "${POST_TO_API_DONE:-}" == "true" && "${POST_UPDATE_DONE:-}" != "true" ]]; then
-    if declare -f post_update_to_api >/dev/null 2>&1; then
-      if [[ $exit_code -ne 0 ]]; then
-        post_update_to_api "failed" "$exit_code"
-      else
-        post_update_to_api "failed" "1"
-      fi
-    fi
-  fi
   [[ -n "${lockfile:-}" && -e "$lockfile" ]] && rm -f "$lockfile"
   exit "$exit_code"
 }
@@ -267,10 +255,6 @@ on_exit() {
 # - Exits with code 130 (128 + SIGINT=2)
 # ------------------------------------------------------------------------------
 on_interrupt() {
-  # Report interruption to telemetry API (prevents stuck "installing" records)
-  if declare -f post_update_to_api >/dev/null 2>&1; then
-    post_update_to_api "failed" "130"
-  fi
   if declare -f msg_error >/dev/null 2>&1; then
     msg_error "Interrupted by user (SIGINT)"
   else
@@ -288,10 +272,6 @@ on_interrupt() {
 # - Triggered by external process termination
 # ------------------------------------------------------------------------------
 on_terminate() {
-  # Report termination to telemetry API (prevents stuck "installing" records)
-  if declare -f post_update_to_api >/dev/null 2>&1; then
-    post_update_to_api "failed" "143"
-  fi
   if declare -f msg_error >/dev/null 2>&1; then
     msg_error "Terminated by signal (SIGTERM)"
   else