This change adds the Telegraf configuration to collect swap metrics, the
associated Prometheus alarms and graphs to the Grafana dashboard.

Change-Id: I3595fd0b8cab06215c620642da69dd29c398396a

Change-Id: If50f18367b22338b3fba1ff15902d557a0bdf2ea

Change-Id: I54e02e0741d53ec7b2335145dc968b7b8c8f5e00

Change-Id: I1765fc6aa4a8c3da25330f19bb043ddbf548b9ad

Change-Id: I66576b4ed40ef160c5f13747a908f018f252b6b4