Returns a function defined by the given fntail, which will install the same MDC context map in effect as in the thread at the time mdc-fn was called. This may be used to define a helper function which runs on a different thread, but needs to preserve the MDC context.

Returns a function, which will install the same MDC context map in effect as in the thread at the time mdc-fn* was called and then call f with any given arguments. This may be used to define a helper function which runs on a different thread, but needs to preserve the MDC context.

Remove a key to the current Mapped Diagnostic Context

Add a key to the current Mapped Diagnostic Context

Execute body with the Mapped Diagnostic Context updated from keys found in the ctx map.