Tag/match not working for OpenTelemetry input

[carlosli888]

Bug Report

Describe the bug
If I want to output logs received via OpenTelemetry plugin, I am forced to use * as the Match string. If I use anything else, logs are not sent to the output plugins.

To Reproduce

• Steps to reproduce the problem:

1. Start an instance of FluentBit as a server.

[INPUT]
    Name                opentelemetry
    Listen              0.0.0.0
    Port                4319
    Tag                 otel
[OUTPUT]
    Name                stdout
    Match               otel

2. Use another instance of FluentBit to act as a log generator.

[INPUT]
    Name                dummy 
[OUTPUT]
    Name                opentelemetry
    Match               *
    Host                127.0.0.1
    Port                4319

3. If we examine the output from the FluentBit acting as a server, nothing is shown. However, if we change the Match string of the Stdout plugin to *, then it works.

Expected behavior
I expect routing to work the same way for all plugins except Forward as described by [https://docs.fluentbit.io/manual/concepts/key-concepts#tag]. Alternatively, if the Match string needs to match the original source, this is clearly documented and it works. Currently, adding the otel tag to the Dummy input makes no difference.

Screenshots

Your Environment

• Version used: 2.1.8
• Configuration: See reproduction steps above
• Environment name and version (e.g. Kubernetes? What version?): See OS below
• Server type and version:
• Operating System and version: Windows 10
• Filters and plugins: See reproduction steps above

Additional context
This was first discovered while troubleshooting why logs were not being sent to Loki.

[nokute78]

Tag seems to be composed by uri.
e.g. v1_metrics from /v1/metrics

I sent a patch to create a tag from property tag.
#8134

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[github-actions]

This issue was closed because it has been stalled for 5 days with no activity.