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

As we resign to develop full-stack solution to monitor cron jobs

This reverts commit 697ce4bf04.

Change-Id: Icab6008011141bb658c836897a05018dd6ce2984

Change-Id: I710b65decf6697d0bb5d21fc3fc2d332b78119c5
Closes-bug: PROD-21073

Change-Id: I9e8464e3ee5ef28ca5eb7eb84e645e42fb6576cd
Closes-bug: PROD-20466

Change alerts names, severity and descriptions.

Closes-bug: PROD-19718
Change-Id: I238fbcd51cf48389b504ccb531ba9b2bc9dd4be6

Partial-Bug: PROD-16264

Change-Id: I4f548a95bfb83076301f4669c1ff662c213c4aa3

Change-Id: Ic3c3186f42762062a65d340010b0ebff40f7c577
Partial-Bug: PROD-16264

Change-Id: I5a8ccb235d36c1b4115794904f373a5704c2296d

Change-Id: I646a852be587598ff0866e5941d954a6ac1fdd08

Change-Id: I4fb69e8defa44a9d92a9fb7c23a6280fffc1a3e9

Change-Id: I715f78983c69084c81d4efd4a5625d5dfe0f276f

Change-Id: I87d132ce6473715b0992e561b2855456f24bcb3b

Raise severity from warning to critical

Partial-Bug: PROD-15203
Change-Id: I32f19b5520bc200d61280da57f4ab5842b060454

Change-Id: I67531b6ad15a2e96ee05178f17aae2504b3362bf

The other disk alerts use predict_linear() to trigger before a disk gets
full but they don't trigger when the disk is effectively (or nearly)
full.

Change-Id: I8e6794d35bf96378ca3e3d527db4315d2b3a868d

Change-Id: I1c8e752de9ad3479da830706ae736df6846b977f

Change-Id: Ia7df4918732ce8fcf28b1d6eed629073146a567c

Since metrics on dropped packets are counters, the alerts should use
the rate() function. This change also fixes some inconsistencies in the
alert descriptions.

Change-Id: I9abbc0a49f45ba760836c436a3e7e65aa62f652e

Change-Id: I1cc00b41a6a1774d1401a9f71ab4c6364c65d139

Change-Id: Idc73c152a0e71d5ac2a8c10f46c955755d8e77ae

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