Could not serialize metric: invalid name from cisco_telemetry_gnmi with gNMI interface on Arista

[dgarros]

I'm getting some issue while testing the input plugin cisco_telemetry_gnmi with an arista device.
The plugin is able to open the session but it's having some issue to read the data

2019-09-13T12:39:07Z D! [outputs.file] Could not serialize metric: invalid name
2019-09-13T12:39:07Z D! [outputs.file] Could not serialize metric: invalid name
2019-09-13T12:39:07Z D! [outputs.file] Could not serialize metric: invalid name

Since gNMI is a standard interface, it would expect it that to work.

Relevant telegraf.conf:

[[inputs.cisco_telemetry_gnmi]]
    [[inputs.cisco_telemetry_gnmi.subscription]]
        origin = "openconfig-interfaces"
        path = "/interfaces"
        # Subscription mode (one of: "target_defined", "sample", "on_change") and interval
        subscription_mode = "target_defined"
        sample_interval = "10s"

System info:

• Telegraf 1.11.4
• Mac OS 10.14.6
• Arista EOS 4.21.1F

Steps to reproduce:

Configure gRPC on Arista device
Start telegraf

Expected behavior:

Since gNMI is a standard interface, the plugin should be able to read the metrics

Actual behavior:

the plugin is reporting some serialization issues

2019-09-13T12:39:07Z D! [outputs.file] Could not serialize metric: invalid name
2019-09-13T12:39:07Z D! [outputs.file] Could not serialize metric: invalid name
2019-09-13T12:39:07Z D! [outputs.file] Could not serialize metric: invalid name
2019-09-13T12:39:07Z D! [outputs.file] Could not serialize metric: invalid name
2019-09-13T12:39:07Z D! [outputs.file] Could not serialize metric: invalid name

Arista Configuration

management api gnmi
   transport grpc TELEMETRY
      port 3333
      vrf MGMT

[danielnelson]

This error can be triggered when the measurement name is the empty string "". Can you try setting name = "interfaces" to verify this is the issue?

[[inputs.cisco_telemetry_gnmi]]
    [[inputs.cisco_telemetry_gnmi.subscription]]
        name = "interfaces"
        origin = "openconfig-interfaces"
        path = "/interfaces"
        # Subscription mode (one of: "target_defined", "sample", "on_change") and interval
        subscription_mode = "target_defined"
        sample_interval = "10s"

[dgarros]

@danielnelson unfortunately the issue is the same when i configure name as well

[danielnelson]

Do you only have this single subscription? If so you can try a more heavy handed name_override which will modify all metrics from the entire plugin.

[[inputs.cisco_telemetry_gnmi]]
  name_override = "interfaces"

  [[inputs.cisco_telemetry_gnmi.subscription]]
    name = "interfaces"
    origin = "openconfig-interfaces"
    path = "/interfaces"
    # Subscription mode (one of: "target_defined", "sample", "on_change") and interval
    subscription_mode = "target_defined"
    sample_interval = "10s"

@sbyx Can you take a look into what might be causing this?

[sbyx]

Investigating on this one, I think I can reproduce this on another platform too.

[dgarros]

I got something when i used name_override=interfaces

interfaces,host=damiens-mbp.lan,name=Management1,source=arista1.lab.com /interfaces/interface/state/counters/out_unicast_pkts=24190i 1568414799237685250
interfaces,host=damiens-mbp.lan,name=Management1,source=arista1.lab.com /interfaces/interface/state/counters/in_octets=3290053i 1568414799237685250
interfaces,host=damiens-mbp.lan,name=Management1,source=arista1.lab.com /interfaces/interface/state/counters/out_unicast_pkts=24188i 1568414798233622500
interfaces,host=damiens-mbp.lan,name=Management1,source=arista1.lab.com /interfaces/interface/state/counters/in_unicast_pkts=32770i 1568414798233622500
interfaces,host=damiens-mbp.lan,name=Management1,source=arista1.lab.com /interfaces/interface/state/counters/in_octets=3289825i 1568414798233622500
interfaces,host=damiens-mbp.lan,name=Management1,source=arista1.lab.com /interfaces/interface/state/counters/out_octets=3984589i 1568414798233622500

@sbyx let me know if I can help, if needed i can give you access to my setup

[danielnelson]

@dgarros Would you be able to test with the code in #6403?

[dgarros]

@danielnelson @sbyx I tested the fix in #6403 and I can confirm it's working as expected for me.
I'm able to collect interfaces stat from arista over gNMI without name or name_override defined
Thanks for the quick fix