Update OpAMP port to 4320

[RassK]

Why

open-telemetry/opentelemetry-dotnet-contrib#4374
open-telemetry/opamp-spec#323

What

OpAMP port was changed from 4318 to 4320

Tests

Updated.

Checklist

• CHANGELOG.md is updated.
• Documentation is updated.
• New features are covered by tests.

[RassK]

A few locations should be fixed in proto as well >
open-telemetry/opamp-spec#323 (comment)

[RassK]

A few locations should be fixed in proto as well > open-telemetry/opamp-spec#323 (comment)

Updated opamp proto to v0.17.0

[RassK]

Should include a new opamp client version also here, so ports align with versions. Converting to draft.

[RassK]

Should include a new opamp client version also here, so ports align with versions. Converting to draft.

OpAmp version bumped here: #5093

[Copilot]

Pull request overview

Updates OpAMP configuration defaults and related test/spec artifacts to reflect the OpAMP default port change from 4318 to 4320, aligning this repo’s docs/tests (and embedded OpAMP proto used by integration tests) with upstream spec changes.

Changes:

• Updated OpAMP server URL examples/expectations in unit tests and file-based configuration test YAML to use port 4320.
• Updated documentation and changelog to reflect the new default OpAMP port (4320).
• Updated the embedded opamp.proto used by IntegrationTests (including the URL example and additional upstream schema changes).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/OpenTelemetry.AutoInstrumentation.Tests/Configurations/FileBased/Parser/ParserOpAmpTests.cs	Updates expected OpAMP server URL port in parser tests.
test/OpenTelemetry.AutoInstrumentation.Tests/Configurations/FileBased/Files/TestOpAmpFile.yaml	Updates test YAML OpAMP server URL to port 4320.
test/OpenTelemetry.AutoInstrumentation.Tests/Configurations/FileBased/FileBasedOpAmpSettingsTests.cs	Updates OpAMP settings test URL to port 4320.
test/IntegrationTests/opentelemetry/proto/opamp/opamp.proto	Updates embedded OpAMP proto (including example URL port) and syncs additional spec changes.
src/OpenTelemetry.AutoInstrumentation/Configurations/FileBasedConfiguration/OtlpHttpExporterConfig.cs	Updates an OTLP HTTP exporter doc comment (currently to 4320).
docs/file-based-configuration.md	Updates OpAMP configuration example to port 4320.
docs/config.md	Updates default value shown for OTEL_DOTNET_AUTO_OPAMP_SERVER_URL to port 4320.
CHANGELOG.md	Records OpAMP default port change from 4318 to 4320.

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