Add MaxRequestSize option to OTLP exporters

[pellared]

Per and blocked by: open-telemetry/opentelemetry-proto#782

• Introduced WithMaxRequestSize option for OTLP exporters to set a limit on the size of serialized export requests.
• Implemented logic in the HTTP and gRPC clients to check the request size against the configured maximum before compression and sending.
• The default configuration is that the maximum request size is 32 MiB.

[codecov]

Codecov Report

❌ Patch coverage is 98.51852% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.1%. Comparing base (8d70624) to head (5f4da20).

Files with missing lines	Patch %	Lines
exporters/otlp/otlplog/otlploghttp/client.go	80.0%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #8157   +/-   ##
=====================================
  Coverage   82.0%   82.1%           
=====================================
  Files        308     308           
  Lines      24060   24128   +68     
=====================================
+ Hits       19748   19810   +62     
- Misses      3936    3942    +6     
  Partials     376     376           

Files with missing lines	Coverage Δ
exporters/otlp/otlplog/otlploggrpc/client.go	95.7% <100.0%> (+1.7%)	⬆️
exporters/otlp/otlplog/otlploggrpc/config.go	92.8% <100.0%> (+0.2%)	⬆️
exporters/otlp/otlplog/otlploghttp/config.go	94.2% <100.0%> (+0.1%)	⬆️
exporters/otlp/otlpmetric/otlpmetricgrpc/client.go	92.7% <100.0%> (+0.2%)	⬆️
exporters/otlp/otlpmetric/otlpmetricgrpc/config.go	45.6% <100.0%> (+1.9%)	⬆️
...tlpmetric/otlpmetricgrpc/internal/oconf/options.go	90.2% <100.0%> (+0.4%)	⬆️
exporters/otlp/otlpmetric/otlpmetrichttp/client.go	83.8% <100.0%> (+0.2%)	⬆️
exporters/otlp/otlpmetric/otlpmetrichttp/config.go	88.5% <100.0%> (+0.6%)	⬆️
...tlpmetric/otlpmetrichttp/internal/oconf/options.go	93.2% <100.0%> (+0.2%)	⬆️
exporters/otlp/otlptrace/otlptracegrpc/client.go	91.2% <100.0%> (+0.2%)	⬆️
... and 6 more

... and 4 files with indirect coverage changes

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[Copilot]

Pull request overview

This PR adds a configurable maximum request size for OTLP exporters (traces, metrics, logs) and enforces it in both HTTP and gRPC clients to fail oversized exports early. The default maximum request size is set to 32 MiB (applies to serialized payload size before compression).

Changes:

• Introduce WithMaxRequestSize option across OTLP trace/metric/log exporters and plumb it through configs.
• Enforce max request size checks in HTTP (byte length of marshaled request) and gRPC (protobuf encoded size) clients before sending.
• Add unit tests verifying default behavior and that oversized requests fail before any network call.

Reviewed changes

Copilot reviewed 33 out of 33 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
internal/shared/otlp/otlptrace/otlpconfig/options.go.tmpl	Adds DefaultMaxRequestSize and MaxRequestSize to trace shared config + option wiring.
internal/shared/otlp/otlptrace/otlpconfig/options_test.go.tmpl	Tests default and WithMaxRequestSize behavior for shared trace config.
internal/shared/otlp/otlpmetric/oconf/options.go.tmpl	Adds DefaultMaxRequestSize and MaxRequestSize to metric shared config + option wiring.
internal/shared/otlp/otlpmetric/oconf/options_test.go.tmpl	Tests default and WithMaxRequestSize behavior for shared metric config.
exporters/otlp/otlptrace/otlptracehttp/options.go	Exposes WithMaxRequestSize on the OTLP trace HTTP exporter options.
exporters/otlp/otlptrace/otlptracehttp/internal/otlpconfig/options.go	Adds default max request size + config field + option wiring for trace HTTP exporter internals.
exporters/otlp/otlptrace/otlptracehttp/internal/otlpconfig/options_test.go	Tests default and WithMaxRequestSize behavior for trace HTTP internal config.
exporters/otlp/otlptrace/otlptracehttp/client.go	Enforces max request size for HTTP trace exports before sending.
exporters/otlp/otlptrace/otlptracehttp/client_test.go	Adds test to ensure oversized HTTP trace requests fail before any request is sent.
exporters/otlp/otlptrace/otlptracegrpc/options.go	Exposes WithMaxRequestSize on the OTLP trace gRPC exporter options.
exporters/otlp/otlptrace/otlptracegrpc/internal/otlpconfig/options.go	Adds default max request size + config field + option wiring for trace gRPC exporter internals.
exporters/otlp/otlptrace/otlptracegrpc/internal/otlpconfig/options_test.go	Tests default and WithMaxRequestSize behavior for trace gRPC internal config.
exporters/otlp/otlptrace/otlptracegrpc/client.go	Enforces max request size for gRPC trace exports before calling Export.
exporters/otlp/otlptrace/otlptracegrpc/client_test.go	Adds test to ensure oversized gRPC trace requests fail before reaching the collector.
exporters/otlp/otlpmetric/otlpmetrichttp/internal/oconf/options.go	Adds default max request size + config field + option wiring for metric HTTP exporter internals.
exporters/otlp/otlpmetric/otlpmetrichttp/internal/oconf/options_test.go	Tests default and WithMaxRequestSize behavior for metric HTTP internal config.
exporters/otlp/otlpmetric/otlpmetrichttp/config.go	Exposes WithMaxRequestSize on the OTLP metric HTTP exporter options.
exporters/otlp/otlpmetric/otlpmetrichttp/client.go	Enforces max request size for HTTP metric exports before sending.
exporters/otlp/otlpmetric/otlpmetrichttp/client_test.go	Adds test to ensure oversized HTTP metric requests fail before any request is sent.
exporters/otlp/otlpmetric/otlpmetricgrpc/internal/oconf/options.go	Adds default max request size + config field + option wiring for metric gRPC exporter internals.
exporters/otlp/otlpmetric/otlpmetricgrpc/internal/oconf/options_test.go	Tests default and WithMaxRequestSize behavior for metric gRPC internal config.
exporters/otlp/otlpmetric/otlpmetricgrpc/config.go	Exposes WithMaxRequestSize on the OTLP metric gRPC exporter options.
exporters/otlp/otlpmetric/otlpmetricgrpc/client.go	Enforces max request size for gRPC metric exports before calling Export.
exporters/otlp/otlpmetric/otlpmetricgrpc/client_test.go	Adds test to ensure oversized gRPC metric requests fail before reaching the collector.
exporters/otlp/otlplog/otlploghttp/config.go	Adds max request size to log HTTP exporter config, defaulting to 32 MiB, and exposes WithMaxRequestSize.
exporters/otlp/otlplog/otlploghttp/config_test.go	Updates config tests to cover default and explicit max request size settings.
exporters/otlp/otlplog/otlploghttp/client.go	Enforces max request size for HTTP log exports before sending.
exporters/otlp/otlplog/otlploghttp/client_test.go	Adds test to ensure oversized HTTP log requests fail before any request is sent.
exporters/otlp/otlplog/otlploggrpc/config.go	Adds max request size to log gRPC exporter config, defaulting to 32 MiB, and exposes WithMaxRequestSize.
exporters/otlp/otlplog/otlploggrpc/config_test.go	Updates config tests to cover default and explicit max request size settings.
exporters/otlp/otlplog/otlploggrpc/client.go	Enforces max request size for gRPC log exports before calling Export.
exporters/otlp/otlplog/otlploggrpc/client_test.go	Adds test to ensure oversized gRPC log requests fail before sending.
CHANGELOG.md	Documents the new option and the default 32 MiB request size limit behavior.

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[dashpole]

Just nits and questions for my own education