Python exception error

[sheevaeva]

Hello
I'm in the process of configuring ping exporter and the issue i'm facing is the metric values are not populated on Prometheus (metrics are available). If I access http://IP:8085/probe?prot=4&target=target_ip in the browser i see the values as below:

ping_avg 21.0
ping_max 21.9
ping_min 20.6
ping_loss 0

Prometheus config looks like this
'''

• job_name: 'ping-exporter'
  scrape_interval: 60s
  metrics_path: /probe
  params:
  prot: ['4']
  static_configs:
  - targets:
  - target_ip
  relabel_configs:
  - source_labels: [address]
  target_label: __param_target
  - source_labels: [__param_target]
  target_label: instance
  - target_label: address
  replacement: Prom_IP:8085

'''
As i run the exporter I see below exception :

2019-09-21 09:44:29,097 root INFO /usr/bin/fping -4 -b 56 -i 1 -p 500 -q -c 10 Target_ip
client_ip - - [21/Sep/2019 09:44:33] "GET /probe?prot=4&target=target_ip HTTP/1.1" 200 -

Exception happened during processing of request from ('Prom_IP', 64464)
Traceback (most recent call last):
File "/usr/lib/python2.7/SocketServer.py", line 596, in process_request_thread
self.finish_request(request, client_address)
File "/usr/lib/python2.7/SocketServer.py", line 331, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/lib/python2.7/SocketServer.py", line 652, in init
self.handle()
File "/usr/lib/python2.7/BaseHTTPServer.py", line 340, in handle
self.handle_one_request()
File "/usr/lib/python2.7/BaseHTTPServer.py", line 328, in handle_one_request
method()
File "/opt/ping-exporter.py", line 58, in do_GET
address = value['target'][0]
KeyError: 'target'

Would like to know why are the values not populating on Prometheus metrics. Kindly help!

Thanks

[iceman91176]

The python exception happens everytime the exporter is queried without target query-param. If you call it from a browser the brower usually tries to get a favicon from the webserver.
The exception should not occur when scraping with curl (or from prometheus) - it is just an annoying error that fills up the log.