UnicodeEncode error with webhook sink when message contain a non-ASCII character

[Tassatux]

Describe the bug
UnicodeEncode error with webhook sink when finding message contain a non-ASCII character, like an emoji added by cpu_throttling enricher.

To Reproduce
Steps to reproduce the behavior:

1. Configure a webhook sink
2. Send Prometheus CPUThrottlingHigh alert

Expected behavior
The message should be encoded in utf-8 so bytes will be provided to requests.post() instead of unicode.

By default, if a python string (unicode) is provided to the http.client lib (used by requests), it will be encoded in latin-1 following RFC 2616.

Traceback

\u001b[32m2023-10-04 15:16:02.999 INFO     Loaded k8s pod netbox-prometheus-sd-fcc8c5c95-mv72k for alert CPUThrottlingHigh\u001b[0m
UnicodeEncodeError: 'latin-1' codec can't encode character '\\U0001f4d8' in position 194: Body ('📘') is not valid Latin-1. Use body.encode('utf-8') if you want to send it encoded in UTF-8.\u001b[0m
    raise UnicodeEncodeError(
  File \"/usr/local/lib/python3.9/http/client.py\
    body = _encode(body
  File \"/usr/local/lib/python3.9/http/client.py\
    self._send_request(method
  File \"/usr/local/lib/python3.9/http/client.py\
    super(HTTPConnection
  File \"/usr/local/lib/python3.9/site-packages/urllib3/connection.py\
    conn.request(method
  File \"/usr/local/lib/python3.9/site-packages/urllib3/connectionpool.py\
    httplib_response = self._make_request(
  File \"/usr/local/lib/python3.9/site-packages/urllib3/connectionpool.py\
    resp = conn.urlopen(
  File \"/usr/local/lib/python3.9/site-packages/requests/adapters.py\
    r = adapter.send(request
  File \"/usr/local/lib/python3.9/site-packages/requests/sessions.py\
    resp = self.send(prep
  File \"/usr/local/lib/python3.9/site-packages/requests/sessions.py\
    return session.request(method=method
  File \"/usr/local/lib/python3.9/site-packages/requests/api.py\
    return request('post'
  File \"/usr/local/lib/python3.9/site-packages/requests/api.py\
    r = requests.post(self.url
  File \"/app/src/robusta/core/sinks/webhook/webhook_sink.py\
Traceback (most recent call last):
None
 headers: 
\u001b[31m2023-10-04 15:16:01.011 ERROR    Webhook request error

[aantn]

Thanks for reporting - that looks like a bug!

Would you be interested in contributing a PR to fix? We are understaffed at the moment given world events, so it will take longer than usual for us to fix ourselves. Hope you understand!

[aantn]

@swastik959 this is fixed now, right? Would it be alright to close?