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=encoding UTF-8
=head1 NAME
OpenTelemetry::Trace::Link - A link to an OpenTelemetry span
=head1 SYNOPSIS
    use OpenTelemetry::Trace::Link;
    my $link = OpenTelemetry::Trace::Link->new(
        context    => $span_context,
        attributes => \%attributes,
    );
    # Or more realistically
    use OpenTelemetry;
    my $span = OpenTelemetry->tracer_provider->tracer->create_span(
        ...,
        links => [
            {
                context    => $other_span->context,
                attributes => \%attributes,
            },
            ...
        ],
    );
=head1 DESCRIPTION
Spans created by a L<OpenTelemetry::Trace::Tracer> (or one of its subclasses)
may be linked to zero or more other spans that are causally related. This can
be useful to represent batched operations, where a span representing the
entire operation is linked to multiple spans representing each item making up
the batch; or fork/join operations, where all forks are under a single span
representing the aggregation of all tasks. See the
L<OpenTelemetry specification|https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/overview.md#links-between-spans>
for more details on links.
Note that links can only be added to a span at creation time, and only through
the C<links> parameter to L<OpenTelemetry::Trace::Tracer/create_span>. Please
refer to that module's documentation for more details.
=head1 METHODS
This class implements the L<OpenTelemetry::Attributes> role. Please consult
that module's documentation for details on the behaviours it provides.
=head2 new
    my $link = OpenTelemetry::Trace::Link->new(
        context => $span_context,
    );
Create a new link to a different span. The context parameter must be set to
a valid L<OpenTelemetry::Trace::SpanContext>, which will identify the span to
link to.
=head2 context
    $span_context = $link->context;
Retrieves the span context of the span this instance links to.
=head1 SEE ALSO
=over
=item L<OpenTelemetry::Attributes>
=item L<OpenTelemetry::SDK::Trace::Span>
=item L<OpenTelemetry specification on span links|https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/overview.md#links-between-spans>
=back
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2023 by José Joaquín Atria.
This is free software; you can redistribute it and/or modify it under the same
terms as the Perl 5 programming language system itself.