Expose several metrics related constants

[fvdcx]

In my MCP server, I need to track usage data of tool calls, since SDK isn't exposing constants like internal static ActivitySource ActivitySource { get; } = new("Experimental.ModelContextProtocol"); , I have to do this in my application

        internal const string MCPActivitySourceName = "Experimental.ModelContextProtocol";
        internal const string MCPMethodName = "mcp.method.name";
        internal const string MCPErrorType = "error.type";
        internal const string MCPToolName = "mcp.tool.name";

Is it possible to expose them from the sdk side?

[stephentoub]

"error.type" is a standard tag in otel. We wouldn't expose a property for it.

"mcp.method.name" and "mcp.tool.name" are very likely to change, not just in value but in existence; they're part of a proposal for an otel spec that hasn't even been merged yet. I don't see us adding public surface area for them.

"Experimental.Modelcontextprotocol" is the default name of the activity source. I don't think we'd expose a property for that, but we might expose something to enable it to be configured to whatever you want it to be set to, eg an environment variable.

[fvdcx]

"error.type" is a standard tag in otel. We wouldn't expose a property for it.

"mcp.method.name" and "mcp.tool.name" are very likely to change, not just in value but in existence; they're part of a proposal for an otel spec that hasn't even been merged yet. I don't see us adding public surface area for them.

"Experimental.Modelcontextprotocol" is the default name of the activity source. I don't think we'd expose a property for that, but we might expose something to enable it to be configured to whatever you want it to be set to, eg an environment variable.

So in your opinion, what's the best way of logging usage data/counters which need method/tool name as a dimension, I like the otel way