Add extra logging for debugging 500 responses *not for dev branch*

src/authenticationsproutlet.cpp

@@ -871,7 +871,7 @@ void AuthenticationSproutletTsx::create_challenge(pjsip_digest_credential* crede
       // We've failed to store the nonce in memcached, so we have no hope of
       // successfully authenticating any repsonse to a 401 Unauthorized.  Send
       // a 500 Server Internal Error instead.
-      TRC_DEBUG("Failed to store nonce in memcached");
+      TRC_ERROR("Failed to store nonce in memcached, for impi %s", impi.c_str());
       rsp->line.status.code = PJSIP_SC_INTERNAL_SERVER_ERROR;
       rsp->line.status.reason = *pjsip_get_status_text(PJSIP_SC_INTERNAL_SERVER_ERROR);
 

src/registrarsproutlet.cpp

@@ -529,6 +529,7 @@ void RegistrarSproutletTsx::process_register_request(pjsip_msg *req)
     // Failed to connect to the local store.  Reject the register with a 500
     // response.
     // LCOV_EXCL_START - the can't fail to connect to the store we use for UT
+    TRC_ERROR("Failed to connect to local store, private_id= %s", private_id.c_str());
     st_code = PJSIP_SC_INTERNAL_SERVER_ERROR;
 
     SAS::Event event(trail(), SASEvent::REGISTER_FAILED_REGSTORE, 0);
@@ -604,7 +605,7 @@ void RegistrarSproutletTsx::process_register_request(pjsip_msg *req)
   if (gen_hdr == NULL)
   {
     // LCOV_EXCL_START - can't see how this could ever happen
-    TRC_ERROR("Failed to add RFC 5626 headers");
+    TRC_ERROR("Failed to add RFC 5626 headers to reply");
 
     SAS::Event event(trail(), SASEvent::REGISTER_FAILED_5636, 0);
     event.add_var_param(public_id);

src/subscriptionsproutlet.cpp

@@ -407,6 +407,7 @@ void SubscriptionSproutletTsx::process_subscription_request(pjsip_msg* req)
   {
     // Failed to connect to the local store.  Reject the subscribe with a 500
     // response.
+    TRC_ERROR("Failed to connect to local store for SUBSCRIBE, aor=%s", aor.c_str());
     st_code = PJSIP_SC_INTERNAL_SERVER_ERROR;
 
     // Build and send the reply.

src/thread_dispatcher.cpp

@@ -254,7 +254,7 @@ bool process_queue_element()
             if ((rdata->msg_info.msg->type == PJSIP_REQUEST_MSG) &&
                (rdata->msg_info.msg->line.req.method.id != PJSIP_ACK_METHOD))
             {
-              TRC_DEBUG("Returning 500 response following exception");
+              TRC_ERROR("Returning 500 response following exception");
               reject_with_retry_header(rdata, PJSIP_SC_INTERNAL_SERVER_ERROR);
             }