Finding the correct YANG model #2

Configure MDT using the solution from the first lab:

#XR1
telemetry model-driven
 destination-group TIG
  address-family ipv4 10.100.100.1 port 57500
   encoding self-describing-gpb
   protocol grpc no-tls
  !
 !
 sensor-group SENSOR1
  sensor-path Cisco-IOS-XR-infra-statsd-oper:infra-statistics/interfaces/interface/latest/generic-counters
 !
 subscription SUB1
  sensor-group-id SENSOR1 sample-interval 5000
  destination-id TIG

Configure a static delay value for Gi0/0/0/0.12 under performance-measurement. Add an additional sensor-path which exports the performance measurement delay for only this interface.

Answer

performance-measurement
 interface GigabitEthernet0/0/0/0.12
  delay-measurement
   advertise-delay 123
!
telemetry model-driven
 sensor-group SENSOR1
  sensor-path Cisco-IOS-XR-perf-meas-oper:performance-measurement/nodes/node/interfaces/interface-details/interface-detail[interface-name="GigabitEthernet0/0/0/0.12"]/delay-measurement-session/last-advertisement-information/advertised-values/minimum

Explanation

This path is a bit easier to find. First I use yang-operational to find the YANG model that contains the show output for performance-measurement:

Next, I limit the output to only interface Gi0/0/0/0.12. This is very similar to limiting the output of the interface’s general statistics we saw in the “Filtering Data using XPATH” lab.

Cisco-IOS-XR-perf-meas-oper:performance-measurement/nodes/node/interfaces/interface-details/interface-detail[interface-name="GigabitEthernet0/0/0/0.12"]

At this point, you can be done with the path. Optionally, you can continue drilling down onto just the minimum advertised value. I found this path by copying and pasting the output from run mdt_exec into python and using pprint.

Use the following Grafana query:

from(bucket: "telemetry")
  |> range(start: v.timeRangeStart, stop:v.timeRangeStop)
  |> filter(fn: (r) =>
    r._measurement == "Cisco-IOS-XR-perf-meas-oper:performance-measurement/nodes/node/interfaces/interface-details/interface-detail" and
    r._field == "delay_measurement_session/last_advertisement_information/advertised_values/minimum"
  )

You should see the static value of 123: