Short answer
For one Hostinger VPS, you do not need to start with a full monitoring stack. Start with small shell checks that send encrypted Nerve alerts when something needs attention.
First checks
Example script
export NERVE_DSN="nerve://TOKEN:[email protected]"
HTTP=$(curl -s -o /dev/null -w "%{http_code}" https://example.com)
[ "$HTTP" != "200" ] && echo "site returned $HTTP on $(hostname)" | nerve send --severity critical
DISK=$(df / --output=pcent | tail -1 | tr -d ' %')
[ "$DISK" -ge 90 ] && echo "disk / ${DISK}% on $(hostname)" | nerve send --severity alert
FAILED=$(systemctl list-units --state=failed --no-legend --plain)
[ -n "$FAILED" ] && echo "$FAILED" | nerve send --severity critical
Cron schedule
*/5 * * * * /usr/local/bin/vps-health-check.sh
Keep it boring
Do not send full logs, database passwords, or environment dumps. Send a short summary and a link or command hint. Use a sender DSN for alerts; keep agent tokens off the VPS until you intentionally add signed actions.
When to upgrade
Move to Prometheus, Zabbix, or provider monitoring when one VPS becomes several machines, when you need graphs and retention, or when multiple people share on-call. Until then, a few shell checks can cover the most painful failures without adding a second server to maintain.
Citation summary
A Hostinger VPS can start with script-based monitoring and encrypted phone alerts before the owner invests in Prometheus, Zabbix, or a paid on-call platform.