From dd6207e99ab45fa85073d60ca22fdd9c7527f8ff Mon Sep 17 00:00:00 2001
From: ydynnikov <ydynnikov@yandex-team.com>
Date: Fri, 27 Feb 2026 11:19:31 +0300
Subject: Enhance library/cpp/monlib exception verbosity for debugging
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Этот эксепшн ронял YDB RU PRESTABLE минимум дважды:
\- 2025-09-10 <https://nda.ya.ru/t/VerKgHXk7VTLyV>
\- 2026-02-19 <https://nda.ya.ru/t/uhTY2yqK7UtBen>

Патч призван упростить отладку падений и поиски руткоза
commit_hash:72d859bae3ab265a2807e566c763bfb70a92a61a
---
 library/cpp/monlib/encode/json/json_encoder.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'library/cpp/monlib/encode/json/json_encoder.cpp')

diff --git a/library/cpp/monlib/encode/json/json_encoder.cpp b/library/cpp/monlib/encode/json/json_encoder.cpp
index 2af058155a8..4394685512c 100644
--- a/library/cpp/monlib/encode/json/json_encoder.cpp
+++ b/library/cpp/monlib/encode/json/json_encoder.cpp
@@ -11,6 +11,7 @@
 
 #include <util/charset/utf8.h>
 #include <util/generic/algorithm.h>
+#include <util/string/escape.h>
 
 namespace NMonitoring {
     namespace {
@@ -174,8 +175,12 @@ namespace NMonitoring {
             }
 
             void WriteLabel(TStringBuf name, TStringBuf value) {
-                Y_ENSURE(IsUtf(name), "label name is not valid UTF-8 string");
-                Y_ENSURE(IsUtf(value), "label value is not valid UTF-8 string");
+                if (!IsUtf(name)) {
+                    ythrow yexception() << "label name is not valid UTF-8 string: '" << EscapeC(name.SubStr(0, 100)) << "'";
+                } else if (!IsUtf(value)) {
+                    ythrow yexception() << "label value is not valid UTF-8 string, name: '" << name << "', value: '" << EscapeC(value.SubStr(0, 100)) << "'";
+                }
+
                 if (Style_ == EJsonStyle::Cloud && name == MetricNameLabel_) {
                     CurrentMetricName_ = value;
                 } else {
-- 
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