The event monitoring API currently provides a means of accepting context, but does not provide a means of storing request-specific context.

The driver already maintains a map, but does not expose it in any way to users. Any monitoring code that wishes to associate a request's started and finished events must therefore maintain its own map.

Ideally the event monitoring API would provide a method for storing and retrieving arbitrary data against the request. This could be added in a backwards-compatible manner by utilising the existing context parameter, e.g.

package event

func SetValue(ctx context.Context, key, value interface{})
func GetValue(ctx context.Context, key interface{}) (interface{}, bool)