docs(dotnet): Document Serilog per-sink minimum level options

[jamescrosswell]

DESCRIBE YOUR PR

Documents the new Serilog per-sink minimum level configuration added in getsentry/sentry-dotnet#5181 (fixes getsentry/sentry-dotnet#4957), shipping in Sentry.Serilog 6.8.0.

• Adds a "Filtering Which Log Events Reach Sentry" section to the Serilog guide explaining how the per-sink minimum level differs from MinimumBreadcrumbLevel/MinimumEventLevel, with code and appsettings.json examples
• Documents the new RestrictedToMinimumLevel and LevelSwitch options
• Notes that configuring this in code requires Sentry.Serilog 6.8.0+ (previously only possible via appsettings.json)

Note: the C# snippets were compiled against sentry-dotnet@main to confirm they build. The version number in the alert assumes the next release is 6.8.0 — please double-check once it's tagged.

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[sentry]

Bug: The documentation incorrectly claims RestrictedToMinimumLevel filters structured logs. This setting likely only affects breadcrumbs and events, not structured logs sent to Sentry.
_{Severity: MEDIUM}

Suggested Fix

Verify the actual behavior of RestrictedToMinimumLevel in the sentry-dotnet SDK. If it does not filter structured logs, remove the statement "This also controls which log entries are sent to Sentry as structured logs" from the documentation. The filtering of structured logs should be attributed to the global MinimumLogLevel.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: docs/platforms/dotnet/guides/serilog/index.mdx#L132-L136

Potential issue: The documentation update claims that the Serilog sink's
`RestrictedToMinimumLevel` setting controls which log entries are sent to Sentry as
structured logs. This is likely incorrect. Based on the pattern in the
`Extensions.Logging` integration and existing Serilog documentation, per-sink level
filters typically only apply to breadcrumbs and events. The global `MinimumLogLevel` is
what likely controls structured log capturing. Users following this new documentation
may mistakenly believe they are filtering structured logs, leading to more data being
sent to Sentry than intended.

_{Did we get this right? 👍 / 👎 to inform future reviews.}