full memory tracking and profiling of Netdata Agent (#13789)

* full memory tracking and profiling of Netdata Agent

* initialize dbengine only when it is needed

* handling of dbengine compiled but not available

* restore unittest

* restore unittest again

* more improvements about ifdef dbengine

* fix compilation when dbengine is not enabled

* check if dbengine is enabled on exit

* call freez() not free()

* aral unittest

* internal checks activate trace allocations; dev mode activates internal checks

1 files changed, 6 insertions, 1 deletions

diff --git a/web/api/web_api_v1.c b/web/api/web_api_v1.c
index ce4f196be9..9b1b10c3ca 100644
--- a/web/api/web_api_v1.c
+++ b/web/api/web_api_v1.c
@@ -1621,9 +1621,14 @@ int web_client_api_request_v1_dbengine_stats(RRDHOST *host __maybe_unused, struc
 
     BUFFER *wb = w->response.data;
     buffer_flush(wb);
+
+    if(!dbengine_enabled) {
+        buffer_strcat(wb, "dbengine is not enabled");
+        return HTTP_RESP_NOT_FOUND;
+    }
+
     wb->contenttype = CT_APPLICATION_JSON;
     buffer_no_cacheable(wb);
-
     buffer_strcat(wb, "{");
     for(int tier = 0; tier < storage_tiers ;tier++) {
         buffer_sprintf(wb, "%s\n\t\"tier%d\": {", tier?",":"", tier);