code: public static synchronized void popCCMContext(String key, Throwable callstack)
     {
        log.tracef("%s", new TraceEvent("CachedConnectionManager", "NONE", TraceEvent.POP_CCM_CONTEXT,
                                        "NONE", key, callstack != null ? toString(callstack) : ""));
     }
docs: Pop CCM context
  @param key The frame key
  @param callstack The call stack