ResourceBuilder Attribute Value is lost when using int value

[Mario-Hofstaetter]

Bug Report

      <PackageReference Include="OpenTelemetry.Api" Version="1.0.0-rc1.1" />
      <PackageReference Include="OpenTelemetry.Exporter.Jaeger" Version="1.0.0-rc1.1" />
      <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.0.0-rc1.1" />
      <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.0.0-rc1.1" />
      <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.0.0-rc1.1" />

• Runtime version: netcoreapp3.1

Symptom

When adding Attributes to ResourceBuilder, AddAttributes accepts IEnumerable<KeyValuePair<string, object>>.
However, when adding a tag with value as int, the value is discarded / null in jaeger.
When using a string or calling ToString() the value is used.

What is the expected behavior?

Since the parameter is of type object the int value should work.

What is the actual behavior?

The integer value is lost.

Reproduce

BackendServiceResource = ResourceBuilder.CreateDefault()
	.AddService(serviceName:ServiceName, serviceInstanceId:ServiceInstanceId, serviceNamespace:ServiceNamespace, serviceVersion:ServiceVersion)
	.AddAttributes(new []
	{
		new KeyValuePair<string, object>("my.foobar1", 1), // will get lost
		new KeyValuePair<string, object>("my.foobar2", "2"),
		new KeyValuePair<string, object>("my.foobar3", 3.ToString()),
	});

// ...

builder.SetResourceBuilder(BackendServiceResource)
//...

Result in jaeger 1.21.0:

[cijothomas]

Thanks @Mario-Hofstaetter for reporting.
The attributes are currently only supporting bool, long, double, string. We need to make it same as the Tags in activity. I'll make a bug fix.