Monitoring dump1090

Telegraf
1

Hi,

I have telegraf successfully up and running on a raspi, feeding system data into influxdb for grafana.
My question is, I have a service on that pi that provides a json file with all kind of stats about itself via http, how do i get that into the same influxdb as measurements?

Cheers
MH

2

Hello @lemmy04,
Welcome!
Have you checked out the telegraf file plugin?

3

Should have worded it better… the service provides statistics about itself in json format via http, on the address http://127.0.0.1:8754/monitor.json

the content looks like this:
SUSE Paste (it’s longish).

I’m only interested in the value of d11_map_size.

I’ve tried the http input like so:

root@flightpi:~# cat /etc/telegraf/telegraf.d/fr24.conf
[[inputs.http]]
urls = ["http://127.0.0.1:8754/monitor.json"]
method = "GET"
name_override = "fr24"
data_format = "json"

Which to my understanding should give me all the data from that json, tagged with the hostname, under a “category” of “fr24” when I use “explore” in grafana… but it’s not there.

Any ideas?

4

Hello @lemmy04 ,
Have you taken a look at metrics filtering for telegraf?
Specifically fieldpass = ["d11_map_size"]
Also I recommend setting debug = true in the agent portion of your config. Finally, I like to
test that the data is being sent to InfluxDB, run the following (replacing telegraf.conf with the path to your configuration file):

telegraf -config ~/telegraf.conf -test

Have you tried that? If so can you share the resulting line protocol?
Thanks

5

the rest of the data from that host arrives in my influxdb just fine, its just this one thing that doesn’t work…

6

root@flightpi:/etc/telegraf/telegraf.d# telegraf --config /etc/telegraf/telegraf.d/fr24.conf --debug --test
2021-03-18T08:28:29Z I! Starting Telegraf 1.17.3
2021-03-18T08:28:29Z D! [agent] Initializing plugins
2021-03-18T08:28:29Z D! [agent] Starting service inputs
2021-03-18T08:28:30Z D! [agent] Stopping service inputs
2021-03-18T08:28:30Z D! [agent] Input channel closed
2021-03-18T08:28:30Z D! [agent] Stopped Successfully

this is all i get…

I also tried it with the input.exec module and curl on the URL for the status file, same result.
curl on the commandline works…

Any ideas?

Cheers
[L]

7

even if i add the bits from the separate config file directly into telegraf.conf it does fetch the data.

8

Yes.
Your values are all in string format.
The keys of values containing strings must be explicitly named to the json parser, otherwise they will apparently not be read.
I have added the processor plugin to turn the string into an integer.
You can omit this if you want to process the value as a string.

This works:

[[inputs.http]]
  urls = ["https://susepaste.org/view/raw/15081925"]
  method = "GET"
  name_override = "fr24"
  data_format = "json"
  json_string_fields = ["d11_map_size"]
  fieldpass = ["d11_map_size"]

# Convert string to unsigned value type
[[processors.converter]]
  [processors.converter.fields]
    unsigned = ["d11_map_size"]

[[outputs.file]]  # only for debugging
  files = ["dump1090.out"]
  influx_sort_fields = true
1 Like