node_ntp_stratum metric is not exposed by node_exporter to verify NTP time synchronization

[Jayaprakash Rangaswamy]

I'm looking for a metric to verify NTP time synchronization with remote NTP servers located within the organization through node-exporter & Prometheus.

In the below documentation, I see node_ntp_stratum metric is good enough to identify the synchronization against the stratum value. 

https://github.com/prometheus/node_exporter/blob/master/docs/TIME.md#node_ntp_stratum

But I don't see the NTP related metrics available in the list of metrics exposed through node_exporter. 

As per below doc, I tried setting sysctl -w kernel.perf_event_paranoid to 1 but still no luck. 

https://github.com/prometheus/node_exporter#disabled-by-default

No NTP metrics listed: 

curl -X GET http://127.0.0.1:19100/metrics | grep -i 'ntp_'

Other Details:

node_exporter Version - 0.17.0

Prometheus Version - 2.10.0

[Brian Candler]

You did notice that these are in the "disabled by default" section of node_exporter, and you have to enable them with a CLI flag? (--collector.ntp)

$ curl -Ss 127.0.0.1:9100/metrics | egrep '^(node_ntp_|# (HELP|TYPE) node_ntp_)'

# HELP node_ntp_leap NTPD leap second indicator, 2 bits.

# TYPE node_ntp_leap gauge

node_ntp_leap 0

# HELP node_ntp_offset_seconds ClockOffset between NTP and local clock.

# TYPE node_ntp_offset_seconds gauge

node_ntp_offset_seconds 1.4906e-05

# HELP node_ntp_reference_timestamp_seconds NTPD ReferenceTime, UNIX timestamp.

# TYPE node_ntp_reference_timestamp_seconds gauge

node_ntp_reference_timestamp_seconds 1.594660007565626e+09

# HELP node_ntp_root_delay_seconds NTPD RootDelay.

# TYPE node_ntp_root_delay_seconds gauge

node_ntp_root_delay_seconds 0.006286621

# HELP node_ntp_root_dispersion_seconds NTPD RootDispersion.

# TYPE node_ntp_root_dispersion_seconds gauge

node_ntp_root_dispersion_seconds 0.00541687

# HELP node_ntp_rtt_seconds RTT to NTPD.

# TYPE node_ntp_rtt_seconds gauge

node_ntp_rtt_seconds 0.0001571

# HELP node_ntp_sanity NTPD sanity according to RFC5905 heuristics and configured limits.

# TYPE node_ntp_sanity gauge

node_ntp_sanity 1

# HELP node_ntp_stratum NTPD stratum.

# TYPE node_ntp_stratum gauge

node_ntp_stratum 2

[Jayaprakash Rangaswamy]

Thanks Brain Candler. It works.