ext

var (

	// SpanKind hints at relationship between spans, e.g. client/server
	SpanKind = spanKindTagName("span.kind")

	// SpanKindRPCClient marks a span representing the client-side of an RPC
	// or other remote call
	SpanKindRPCClientEnum = SpanKindEnum("client")
	SpanKindRPCClient     = opentracing.Tag{Key: string(SpanKind), Value: SpanKindRPCClientEnum}

	// SpanKindRPCServer marks a span representing the server-side of an RPC
	// or other remote call
	SpanKindRPCServerEnum = SpanKindEnum("server")
	SpanKindRPCServer     = opentracing.Tag{Key: string(SpanKind), Value: SpanKindRPCServerEnum}

	// Component is a low-cardinality identifier of the module, library,
	// or package that is generating a span.
	Component = stringTagName("component")

	// SamplingPriority determines the priority of sampling this Span.
	SamplingPriority = uint16TagName("sampling.priority")

	// PeerService records the service name of the peer
	PeerService = stringTagName("peer.service")

	// PeerHostname records the host name of the peer
	PeerHostname = stringTagName("peer.hostname")

	// PeerHostIPv4 records IP v4 host address of the peer
	PeerHostIPv4 = uint32TagName("peer.ipv4")

	// PeerHostIPv6 records IP v6 host address of the peer
	PeerHostIPv6 = stringTagName("peer.ipv6")

	// PeerPort records port number of the peer
	PeerPort = uint16TagName("peer.port")

	// HTTPUrl should be the URL of the request being handled in this segment
	// of the trace, in standard URI format. The protocol is optional.
	HTTPUrl = stringTagName("http.url")

	// HTTPMethod is the HTTP method of the request, and is case-insensitive.
	HTTPMethod = stringTagName("http.method")

	// HTTPStatusCode is the numeric HTTP status code (200, 404, etc) of the
	// HTTP response.
	HTTPStatusCode = uint16TagName("http.status_code")

	// Error indicates that operation represented by the span resulted in an error.
	Error = boolTagName("error")
)