chore: Add error logging for failed OpenTelemetry HTTP export

[mustakimali]

I spent quite some time trying to get the exporter to send traces to Honeycomb.

The only error I could see wasn't entirely useful.

OpenTelemetry trace error occurred. error processing span "SendError(..)"

I had to

• clone this & some other repo,
• use path dependency
• add some logs

To see the actual reason my traces were not being published. So it should be useful for others too.

Changes

The HTTP exporter prints the endpoint URL and the raw response from the telemetry provider if the request fails.

Before

OpenTelemetry trace error occurred. error processing span "SendError(..)"

After

OpenTelemetry trace error occurred. OpenTelemetry export failed. Url: https://api.honeycomb.io/v1/traces, Response: b"{\"error\":\"unknown API key - check your credentials, region, and API URL\"}\n"

ℹ️ The Url requires allocation, so the log won't be emitted in release mode. The log is mostly useful when setting up tracing locally.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: mustakimali / name: Mohammad Mustakim Ali (24b6334, 6c33148, eaa3eca, d22e70b, d345217, 7df53da, b6e30b9, 87d021a, a1b4b3b, daa1e68, f416b28, 5fd5a9f)
• ✅ login: lalitb / name: Lalit Kumar Bhasin (3d61f0c)
• ✅ login: cijothomas / name: Cijo Thomas (8212218)

[codecov]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (57c3aa3) 63.7% compared to head (8212218) 63.6%.

Files	Patch %	Lines
opentelemetry-otlp/src/exporter/http/logs.rs	0.0%	11 Missing ⚠️
opentelemetry-otlp/src/exporter/http/trace.rs	0.0%	11 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1498     +/-   ##
=======================================
- Coverage   63.7%   63.6%   -0.1%     
=======================================
  Files        144     144             
  Lines      19983   20005     +22     
=======================================
  Hits       12741   12741             
- Misses      7242    7264     +22     

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[lalitb]

@mustakimali It seems the OTLP HTTP export for logs also suffer from this issue, would you be able to replicate these changes for logs too -

opentelemetry-rust/opentelemetry-otlp/src/exporter/http/logs.rs

Line 34 in 8237f87

client.send(request).await?;

[mustakimali]

@mustakimali It seems the OTLP HTTP export for logs also suffer from this issue, would you be able to replicate these changes for logs too -

opentelemetry-rust/opentelemetry-otlp/src/exporter/http/logs.rs

Line 34 in 8237f87

client.send(request).await?;

@lalitb I've pushed a1b4b3b 👍🏽

[cijothomas]

Thanks for adding these!