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Add metrics from SNTPv4 packet to ntp collector & add ntpd sanity check (#655)

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* Add metrics from SNTPv4 packet to ntp collector & add ntpd sanity check

1. Checking local clock against remote NTP daemon is bad idea, local
ntpd acting as a  client should do it better and avoid excessive load on
remote NTP server so the collector is refactored to query local NTP
server.

2. Checking local clock against remote one does not check local ntpd
itself. Local ntpd may be down or out of sync due to network issues, but
clock will be OK.

3. Checking NTP server using sanity of it's response is tricky and
depends on ntpd implementation, that's why common `node_ntp_sanity`
variable is exported.

* `govendor add golang.org/x/net/ipv4`, it is dependency of github.com/beevik/ntp

* Update github.com/beevik/ntp to include boring SNTP fix

* Use variable name from RFC5905

* ntp: move code to make export of raw metrics more explicit

* Move NTP math to `github.com/beevik/ntp`

* Make `golint` happy

* Add some brief docs explaining `ntp` #655 and `timex` #664 modules

* ntp: drop XXX comment that got its decision

* ntp: add `_seconds` suffix to relevant metrics

* Better `node_ntp_leap` comment

* s/node_ntp_reftime/node_ntp_reference_timestamp_seconds/ as requested by @discordianfish

* Extract subsystem name to const as suggested by @SuperQ
This commit is contained in:
Leonid Evdokimov 2017-09-19 11:36:14 +03:00 • committed by Johannes 'fish' Ziemke
commit c169b4b1c5
169 changed files with 10650 additions and 64 deletions
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README.md
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@ -64,6 +64,7 @@ logind | Exposes session counts from [logind](http://www.freedesktop.org/wiki/So
meminfo\_numa | Exposes memory statistics from `/proc/meminfo_numa`. | Linux
mountstats | Exposes filesystem statistics from `/proc/self/mountstats`. Exposes detailed NFS client statistics. | Linux
nfs | Exposes NFS client statistics from `/proc/net/rpc/nfs`. This is the same information as `nfsstat -c`. | Linux
ntp | Exposes local NTP daemon health to check [time](./docs/TIME.md) | _any_
qdisc | Exposes [queuing discipline](https://en.wikipedia.org/wiki/Network_scheduler#Linux_kernel) statistics | Linux
runit | Exposes service status from [runit](http://smarden.org/runit/). | _any_
supervisord | Exposes service status from [supervisord](http://supervisord.org/). | _any_
@ -78,7 +79,6 @@ Name | Description | OS
---------|-------------|----
gmond | Exposes statistics from Ganglia. | _any_
megacli | Exposes RAID statistics from MegaCLI. | Linux
ntp | Exposes time drift from an NTP server. | _any_
### Textfile Collector