Rename otlp_exporter to otlp_grpc_exporter

[gyanranjanpanda]

Summary

Renames the gRPC-based OTLP exporter module and URN to distinguish it from the newly-added HTTP-based exporter (#2070).

URN change: urn:otel:otlp:exporter → urn:otel:otlp_grpc:exporter
Module rename: otlp_exporter.rs → otlp_grpc_exporter.rs

Fixes #2107

Changes

Rust Source (3 files)

• Renamed otlp_exporter.rs → otlp_grpc_exporter.rs and updated URN constant value
• Updated lib.rs module declaration: pub mod otlp_exporter → pub mod otlp_grpc_exporter
• Updated urn.rs test case URN reference

Config Files (8 files)

All in rust/otap-dataflow/configs/ — replaced plugin_urn from urn:otel:otlp:exporter → urn:otel:otlp_grpc:exporter

Perf Test Templates (9 files)

All in tools/pipeline_perf_test/test_suites/integration/templates/configs/ — same URN replacement

Documentation (3 files)

• crates/quiver/ARCHITECTURE.md — updated node names + URN in config examples
• docs/self_tracing_architecture.md — updated node names in config example
• docs/telemetry/metrics-guide.md — updated metric set name

What Was NOT Changed (by design)

• Test function names (e.g. otlp_exporter_connects_with_mtls) — describe behavior, not module path
• Test file names (otlp_exporter_tls.rs, otlp_exporter_proxy_tls.rs) — no module imports depend on them
• Telemetry crate (otlp_exporter_provider, configure_grpc_otlp_exporter) — separate OTel SDK, not the pipeline exporter
• Constant/struct names (OTLP_EXPORTER_URN, OTLPExporter) — kept per issue scope

Verification

• ✅ cargo build --workspace — passed
• ✅ cargo test --workspace — all tests passed, zero failures
• ✅ grep -r "urn:otel:otlp:exporter" — zero matches remain

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.44%. Comparing base (fc73f05) to head (07ad6c4).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2208   +/-   ##
=======================================
  Coverage   87.44%   87.44%           
=======================================
  Files         558      558           
  Lines      185764   185764           
=======================================
+ Hits       162447   162450    +3     
+ Misses      22791    22788    -3     
  Partials      526      526           

Components	Coverage Δ
otap-dataflow	89.65% <100.00%> (+<0.01%)	⬆️
query_abstraction	80.61% <ø> (ø)
query_engine	90.30% <ø> (ø)
syslog_cef_receivers	∅ <ø> (∅)
otel-arrow-go	52.44% <ø> (ø)
quiver	91.83% <ø> (ø)

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[drewrelmas]

On the surface this looks good to me, will wait for @albertlockett to take a look as he requested the work.

[gyanranjanpanda]

thanks @drewrelmas waiting for @albertlockett feedback