Use pushover-client for alerts.

do-mirroring

@@ -69,7 +69,7 @@ if (( "$ERR" == 0 )); then
   }
 else
   # Mirroring failed, tell the admin.
-  [[ -x "/opt/bin/pushover" ]] && CONFIG_FILE="mirroring" /opt/bin/pushover -T "Mirroring" -p '-1' -m "Mirroring failed"
+  [[ -x /opt/bin/pushover-client ]] && /opt/bin/pushover-client "mirroring" -p -1 -m "Mirroring failure"
   if [[ -n "${EMAIL_TO[*]}" ]]; then
     mailx "${MAILX_ARGS[@]}" -S "from=$EMAIL_FROM" -s "Mirroring failure" "${EMAIL_TO[@]}" <<-EOF 2>/dev/null || \
         { printf "%s: %s\\n" "${0##*/}" "mailx command failed" >&2; RET=1; }