{"source":"semconv","version":"1.44.0","attribute":{"id":"network.protocol.version","type":"string","stability":"stable","brief":"The actual version of the protocol used for network communication.","note":"If protocol version is subject to negotiation (for example using [ALPN](https://www.rfc-editor.org/rfc/rfc7301.html)), this attribute SHOULD be set to the negotiated version. If the actual protocol version is not known, this attribute SHOULD NOT be set.","examples":["1.1","2"],"namespace":"network","definedIn":"model/network/registry.yaml","usedBy":[{"groupId":"attributes.http.client","groupType":"attribute_group","requirementLevel":"recommended"},{"groupId":"attributes.http.common","groupType":"attribute_group","requirementLevel":"recommended"},{"groupId":"attributes.http.server","groupType":"attribute_group","requirementLevel":"recommended"},{"groupId":"mcp.common.attributes","groupType":"attribute_group","requirementLevel":"recommended"},{"groupId":"mcp.operation.metrics.attributes","groupType":"attribute_group","requirementLevel":"recommended"},{"groupId":"mcp.session.metrics.attributes","groupType":"attribute_group","requirementLevel":"recommended"},{"groupId":"metric_attributes.http.client","groupType":"attribute_group","requirementLevel":"recommended"},{"groupId":"metric_attributes.http.client.experimental","groupType":"attribute_group","requirementLevel":"recommended"},{"groupId":"metric_attributes.http.server","groupType":"attribute_group","requirementLevel":"recommended"},{"groupId":"metric.http.client.connection.duration","groupType":"metric","signalName":"http.client.connection.duration","requirementLevel":"recommended"},{"groupId":"metric.http.client.open_connections","groupType":"metric","signalName":"http.client.open_connections","requirementLevel":"recommended"},{"groupId":"metric.http.client.request.body.size","groupType":"metric","signalName":"http.client.request.body.size","requirementLevel":"recommended"},{"groupId":"metric.http.client.request.duration","groupType":"metric","signalName":"http.client.request.duration","requirementLevel":"recommended"},{"groupId":"metric.http.client.response.body.size","groupType":"metric","signalName":"http.client.response.body.size","requirementLevel":"recommended"},{"groupId":"metric.http.server.request.body.size","groupType":"metric","signalName":"http.server.request.body.size","requirementLevel":"recommended"},{"groupId":"metric.http.server.request.duration","groupType":"metric","signalName":"http.server.request.duration","requirementLevel":"recommended"},{"groupId":"metric.http.server.response.body.size","groupType":"metric","signalName":"http.server.response.body.size","requirementLevel":"recommended"},{"groupId":"metric.kestrel.connection.duration","groupType":"metric","signalName":"kestrel.connection.duration","requirementLevel":"recommended"},{"groupId":"metric.kestrel.queued_requests","groupType":"metric","signalName":"kestrel.queued_requests","requirementLevel":"recommended"},{"groupId":"metric.mcp.client.operation.duration","groupType":"metric","signalName":"mcp.client.operation.duration","requirementLevel":"recommended"},{"groupId":"metric.mcp.client.session.duration","groupType":"metric","signalName":"mcp.client.session.duration","requirementLevel":"recommended"},{"groupId":"metric.mcp.server.operation.duration","groupType":"metric","signalName":"mcp.server.operation.duration","requirementLevel":"recommended"},{"groupId":"metric.mcp.server.session.duration","groupType":"metric","signalName":"mcp.server.session.duration","requirementLevel":"recommended"},{"groupId":"network-core","groupType":"attribute_group","requirementLevel":"recommended"},{"groupId":"span.http.client","groupType":"span","requirementLevel":"recommended"},{"groupId":"span.http.server","groupType":"span","requirementLevel":"recommended"},{"groupId":"span.mcp.client","groupType":"span","requirementLevel":"recommended"},{"groupId":"span.mcp.server","groupType":"span","requirementLevel":"recommended"},{"groupId":"trace.mcp.common.attributes","groupType":"attribute_group","requirementLevel":"recommended"}]},"history":[{"version":"1.30.0","publishedAt":"2025-01-24T19:11:42Z","kind":"first-seen","detail":"Already present at v1.30.0, the oldest release tracked here (stable)."}],"replaces":["net.protocol.version"]}