I think the alert is correct so what about adding more swap? You could create a swap file.
EDIT:
To disable the rule you could comment it out in the rules config but that change doesn’t survive a restore.
Edit the memory rule…
runagent -m metrics1 nano rules.d/memory.yml
…and comment out the swap_full rule:
groups:
- name: Memory
rules:
# - alert: swap_full
# expr: ((1 - (node_memory_SwapFree_bytes / node_memory_SwapTotal_bytes)) * 100 > 80)
# for: 2m
# labels:
# severity: warning
# annotations:
# summary: Host swap is filling up (instance {{ $labels.instance }})
# description: "Swap is filling up (>80%)\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
...
Restart the Grafana services:
runagent -m metrics1 ../actions/configure-module/80services