Bump Serilog from 3.0.1 to 3.1.1 in /src

[dependabot]

Bumps Serilog from 3.0.1 to 3.1.1.

Release notes

Sourced from Serilog's releases.

v3.1.1

• #1977 - don't stack overflow when disposing ReusableStringWriter with large renderings (@​nblumhardt)

This is a bugfix for release 3.1.0.

v3.1.0

• #1935 - remove CHANGES.md (@​sungam3r)
• #1936, #1922 - README.md updates (@​nblumhardt)
• #1942 - remove redundant GetTypeInfo() calls (@​SimonCropp)
• #1947 - message template caching performance improvements (@​epeshk)
• #1948 - reduce allocations in Logger.Write() (@​epeshk)
• #1955 breaking - collect and propagate Activity.Current.TraceId and SpanId automatically in Logger.Write() (@​nblumhardt)
• #1964 - don't cache reusable string writers with large buffer sizes (@​Jakimar)
• #1969 - README.md updates (@​bartelink)
• #1971 - drop test coverage for unsupported .NET Core versions (@​bartelink)

Built-in trace and span id support

This release adds two new first-class properties to LogEvent: TraceId and SpanId. These are set automatically in Logger.Write() to the corresponding property values from System.Diagnostics.Activity.Current.

The major benefit of this change is that sinks, once updated, can reliably propagate trace and span ids through to back-ends that support them (in much the same way that first-class timestamps, messages, levels, and exceptions are used today).

The sinks maintained under serilog/serilog, along with formatting helpers such as Serilog.Formatting.Compact and Serilog.Expressions, are already compatible with this change or have pending releases that add compatibility.

Breaking change

Trace and span id collection includes support for {TraceId} and {SpanId} placeholders in output templates (commonly used when formatting text log files). Where previously these names resolved to user-defined properties, they now resolve to the built-in LogEvent.TraceId and LogEvent.SpanId values, respectively.

Impact is expected to be low, because the trace and span id values in any user-added properties are likely to be identical to the built-in ones.

Commits

• 999d686 Merge pull request #1978 from serilog/dev
• 16739f0 Don't stack overflow when disposing ReusableStringWriter (#1977)
• ca4efda Dev version bump [skip ci]
• 765a046 Merge pull request #1975 from serilog/dev
• e37837e chore(docs): Markdown housekeeping (#1969)
• a493ffd chore: Drop test coverage for out of support .NET Core vers (#1971)
• e059e9f Make StringBuilderCapacityThreshold the even power of two that was intended
• 8d0e2ed ReusableStringWriter: Dispose instance with too big buffer (#1964)
• 88f76a8 By reference string comparison in template cache (#1947)
• d6e80e6 Removed temporary array allocations for properties (#1948)
• Additional commits viewable in compare view

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