addTags

Adds tags to the current set of log tags for the current context. Tags are merged together and existing tags cannot be modified. This is deliberate since two pieces of code may not know about each other and could accidentally use the same tag name; in that situation it's important that both tag values are preserved.

Furthermore, the types of data allowed for tag values are strictly controlled. This is also very deliberate since these tags must be efficiently added to every log statement and so it's important that they resulting string representation is reliably cacheable and can be calculated without invoking arbitrary code (e.g. the toString() method of some unknown user type).