chore(deps): update opentelemetry-dotnet monorepo to 1.18.0

[thomhurst]

This PR contains the following updates:

Package	Change	Age	Confidence
OpenTelemetry.Exporter.OpenTelemetryProtocol (source)	1.17.0 → 1.18.0
OpenTelemetry.Extensions.Hosting (source)	1.17.0 → 1.18.0

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Release Notes

open-telemetry/opentelemetry-dotnet (OpenTelemetry.Exporter.OpenTelemetryProtocol)

v1.18.0

Release details: 1.18.0

• Breaking change: The maximum size of a single OTLP export request is now
  64 MiB by default instead of 128 MiB to conform with the OpenTelemetry specification.
  Raise the value of the new OtlpExporterOptions.MaxRequestSizeBytes property
  to increase the capacity.
• Added OtlpExporterOptions.MaxRequestSizeBytes to configure the maximum OTLP
  request size limit, as required by the OpenTelemetry specification. The default
  is the recommended 64 MiB. A batch whose serialized payload exceeds the limit
  is not sent and is dropped in its entirety. The maximum supported value is
  256 MiB.
• Added OtlpExporterOptions.MaxResponseSizeBytes to configure the maximum size
  of a response the exporter will accept, as required by the OpenTelemetry
  specification. The default is the recommended 4 MiB. A response exceeding the
  limit is discarded and treated as a non-retryable failure.
• Added the otel.sdk.processor.log.processed and otel.sdk.processor.span.processed
  SDK self-observability metrics.
• Added support for serializing attribute values that are key/value lists in
  the OTLP, console and Zipkin exporters.
• The OTLP exporter will now export the logger version, if it was specified.
• Add new ITelemetryHostInitializer interface for applications that do not
  support hosted services, such as Blazor, to use to manually initialize the
  OpenTelemetry SDK as part of application startup.
• BatchActivityExportProcessor and SimpleActivityExportProcessor no longer
  forward spans to the exporter once Shutdown has been called, and
  BatchActivityExportProcessor.Shutdown now waits for in-flight OnEnd calls
  to finish enqueueing before flushing.
• Fixed self-diagnostics log lines being silently dropped when an event message
  was too long to fit in the internal buffer. Such content is now truncated.
• Fixed activity creation throwing when multiple tracer providers returned a
  sampler attribute with the same key.
• Fixed logger, meter and tracer providers leaking background threads if an
  exception is thrown by their constructor after resource creation.
• Avoid formatting exceptions and creating exception attributes when
  RecordException is called on a span that is not recorded.
• Fixed UseOtlpExporter to respect options configured with
  services.Configure<OtlpExporterOptions>(...).
• Clamped the server-supplied OTLP/gRPC retry delay (RetryInfo.retry_delay) to
  a minimum value of 100 milliseconds.
• Fixed serialization failures leaving failed trace, metric, and log batches in
  the serializer's per-thread state.
• Fixed the persistent-storage retry thread terminating permanently on an
  unexpected exception.
• Fixed the OTLP exporter from retrying certain non-transient HTTP failures.
• Improved OTLP log attribute serialization performance by avoiding unnecessary
  boxing.
• Improved OTLP histogram serialization performance by avoiding a redundant
  scan of explicit bucket bounds.
• Fixed persistent storage allowing a blob write to exceed the configured
  maximum storage size.
• Improved OTLP/gRPC response status handling performance by avoiding unnecessary
  header enumeration on .NET 8+.
• Fixed the Zipkin exporter to read responses with HttpCompletionOption.ResponseHeadersRead
  for the .NET Framework and .NET Standard targets.
• Fixed inefficient parsing of the Jaeger uber-trace-id header when targeting
  net462 or netstandard2.0.

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This PR has been generated by Mend Renovate CLI.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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• Directory.Packages.props

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📝 Walkthrough

Walkthrough

The package configuration updates OpenTelemetry.Exporter.OpenTelemetryProtocol and OpenTelemetry.Extensions.Hosting from version 1.17.0 to 1.18.0.

Changes

OpenTelemetry package update

Layer / File(s)	Summary
Update OpenTelemetry package versions Directory.Packages.props	The two OpenTelemetry package declarations now use version 1.18.0.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: 🔵 Low · up to d77e2

This upgrade changes the default OTLP request limit to 64 MiB, which can cause oversized telemetry batches to be dropped entirely. The PR is mergeable with owner awareness or follow-up to confirm production payload sizes or configure a suitable limit.

Poem

A rabbit checks the package line,
“One-point-eight” now looks fine.
Two OpenTelemetry hops,
Freshened up the version props.
Ears up—builds proceed in time!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the dependency update from the OpenTelemetry .NET monorepo to version 1.18.0.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch renovate/opentelemetry-dotnet-monorepo

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_{Comment @coderabbitai help to get the list of available commands.}

[greptile-apps]

Greptile Summary

This PR updates the centrally managed OpenTelemetry OTLP exporter and hosting packages from 1.17.0 to 1.18.0.

• Keeps the related OpenTelemetry package versions aligned.
• Adopts the exporter’s new request and response size limits and the fixes included in 1.18.0.

Confidence Score: 5/5

The PR appears safe to merge with no actionable defects identified in the aligned dependency update.

The changed package pins remain aligned, target a compatible project framework, and no repository workload establishes exposure to the exporter’s reduced default request-size limit.

Important Files Changed

Filename	Overview
Directory.Packages.props	Updates both centrally pinned OpenTelemetry dependencies in lockstep; no actionable correctness issue was identified.

_{Reviews (1): Last reviewed commit: "chore(deps): update opentelemetry-dotnet..." | Re-trigger Greptile}