eve: log number of events dropped at exit

src/output-json.c

@@ -720,6 +720,11 @@ static void OutputJsonDeInitCtx(OutputCtx *output_ctx)
 {
     OutputJsonCtx *json_ctx = (OutputJsonCtx *)output_ctx->data;
     LogFileCtx *logfile_ctx = json_ctx->file_ctx;
+    if (logfile_ctx->dropped) {
+        SCLogWarning(SC_WARN_EVENT_DROPPED,
+                "%"PRIu64" events were dropped due to slow or "
+                "disconnected socket", logfile_ctx->dropped);
+    }
     LogFileFreeCtx(logfile_ctx);
     SCFree(json_ctx);
     SCFree(output_ctx);

src/util-error.c

@@ -339,6 +339,7 @@ const char * SCErrorToString(SCError err)
         CASE_CODE (SC_ERR_VAR_LIMIT);
         CASE_CODE (SC_WARN_CHMOD);
         CASE_CODE (SC_WARN_LOG_CF_TOO_MANY_NODES);
+        CASE_CODE (SC_WARN_EVENT_DROPPED);
     }
 
     return "UNKNOWN_ERROR";

src/util-error.h

@@ -329,6 +329,7 @@ typedef enum {
     SC_WARN_DUPLICATE_OUTPUT,
     SC_WARN_CHMOD,
     SC_WARN_LOG_CF_TOO_MANY_NODES,
+    SC_WARN_EVENT_DROPPED,
 } SCError;
 
 const char *SCErrorToString(SCError);