azure_kusto output hangs fluent-bit

[acanovi]

Bug Report

Describe the bug Using azure_kusto output with a proxy server causes fluent-bit random hang

To Reproduce

• Rubular link if applicable:
• Example log message if applicable: log is stuck with this message

  [ info] [output:azure_kusto:azure_kusto.2] loading kusto ingestion resourcs

• Steps to reproduce the problem: Not reproducible, behavior is random

Expected behavior when data is correctly sent to kusto we have these log messages

[ info] [output:azure_kusto:azure_kusto.2] loading kusto ingestion resourcs
[ info] [oauth2] HTTP Status=200
[ info] [oauth2] access token from 'login.microsoftonline.com:443' retrieved

Screenshots

Your Environment

• Version used: 3.1.9
• Configuration: [INPUT] Name cpu Tag cpu Interval_Sec 60

[OUTPUT] Name azure_kusto Match cpu Tenant_Id Client_Id Client_Secret Ingestion_Endpoint Database_Name Table_Name

• Environment name and version (e.g. Kubernetes? What version?): HTTP_PROXY/HTTPS_PROXY environment variables are set in /etc/sysconfig/fluent-bit
• Server type and version: Linux
• Operating System and version: RHEL 8.6
• Filters and plugins:

Additional context restarting fluent-bit restores normal functionality

[patrick-stephens]

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