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

The `linux_netlink.ls` function used a regex to choose which interfaces
to collect metric for.

`_alphanum_re = re.compile(r'^[a-z0-9]+$')`

Unfortunately, by default this excludes vlan and tap interfaces, which
are kind of important.  ie `bond0.120` or `tap2a3dab86-fb`.

We also have a problem where even if we update the regex to include
these interfaces... if someone deletes and spawns a new instance then
the tap device name changes on the compute host, which will not be
monitored unless someone re-runs the `collectd` on the compute again.
Less than ideal.

This commit lets us choose `VerboseInterface "all"` using Pillar data
to avoid this problem.

Change-Id: If50f18367b22338b3fba1ff15902d557a0bdf2ea

Change-Id: I54e02e0741d53ec7b2335145dc968b7b8c8f5e00

Change-Id: If0ee6f1ac5ab697559fcd853225e1520de2e8c1c

Change-Id: Icacb0ca22a34f1ff438a895700040563d250bac9

Change-Id: I008818853c2058746be08365283b949177efa254
Depends-On: I3c3c569a013aff8c3ab8e46cffb93a60d74ddf09

Change-Id: I80193afad1842f67967d1bab164f049078e3cd75

will always be defined since the default is an empty dict)

Change-Id: Id4b0b405872457bd8b20f450e4031d6808d3cf59

Change-Id: I25fb0eb0d4b922b8853eceb0c1c220a4040e1704

Change-Id: I1765fc6aa4a8c3da25330f19bb043ddbf548b9ad

Change-Id: I66576b4ed40ef160c5f13747a908f018f252b6b4

Change-Id: I03bed44bafdebbcd22f487e59ef0de45dfbf3463

Change-Id: Ic3a1e77f2d38c5d916dd3c07211a6ea160559e6f

Change-Id: Ic39fa0f18e0d9aeca0ef73ae6d985d12d15a1c3a

This reverts commit a63f4053f3.

The support for collecting syslog is going to be moved to the rsyslog
formula.

This commit adds more built-in alarms to the Linux formula.

The alerting property can be one of 'disabled', 'enabled' or
'enabled_with_notification'

Currently Syslog doesn't log the priority ('<PRI>').

This is to comply to a comment from @cznewt in
https://github.com/tcpcloud/salt-formula-heka/pull/24.

This patch replaces the "interface" collectd plugin by the "netlink" one. The
"netlink" plugin provides the same metrics as "interface" but plus other
metrics such as the number of dropped packets.

This is now handled by the Heka formula the same way for all the Heka sandbox
decoders. https://github.com/tcpcloud/salt-formula-heka/pull/20

This filter should be configured by the heka formula itself.

The stacklight module dir is /usr/share/lma_collector/common, not
/usr/share/lma_collector_modules. This fixes it.

This fixes the decoder name in meta/heka.yml.

This commit removes the alarm-related filter configuration from meta/heka.yml.
Alarms will be defined in a different way (still under discussion).

This reverts commit 6edb3a7a68.