Since we added to nstat's telegraf plugin the possibility
to collect data from `/proc/net/softnet_stat` regarding
dropped packets and rx_net_action a.k.a time squeeze, we need to enable
it globally on all hosts.
Also grafana dashboard update to include new graphs + added four
new Prometheus alers.
Related-Bug: PROD-21090
Change-Id: I9dfe87bdc8b677a51e3f305dd3c75c7d4cc4e0d4
This change adds the Telegraf configuration to collect swap metrics, the
associated Prometheus alarms and graphs to the Grafana dashboard.
Change-Id: I3595fd0b8cab06215c620642da69dd29c398396a