add name_label page parameter for prometheus format KIKIMR-14564

ref:460fd827b07d7a0cd719c88e6381600b19cdce73

3 files changed, 16 insertions, 3 deletions

diff --git a/library/cpp/monlib/dynamic_counters/encode.cpp b/library/cpp/monlib/dynamic_counters/encode.cpp
index ffa48d276e..26328a44ee 100644
--- a/library/cpp/monlib/dynamic_counters/encode.cpp
+++ b/library/cpp/monlib/dynamic_counters/encode.cpp
@@ -95,7 +95,9 @@ namespace NMonitoring {
 
     }
 
-    THolder<ICountableConsumer> CreateEncoder(IOutputStream* out, EFormat format, TCountableBase::EVisibility vis) {
+    THolder<ICountableConsumer> CreateEncoder(IOutputStream* out, EFormat format,
+        TStringBuf nameLabel, TCountableBase::EVisibility vis)
+    {
         switch (format) {
             case EFormat::JSON:
                 return MakeHolder<TConsumer>(NMonitoring::EncoderJson(out), vis);
@@ -106,7 +108,7 @@ namespace NMonitoring {
                     NMonitoring::ECompression::ZSTD), vis);
             case EFormat::PROMETHEUS:
                 return MakeHolder<TConsumer>(NMonitoring::EncoderPrometheus(
-                    out), vis);
+                    out, nameLabel), vis);
             default:
                 ythrow yexception() << "unsupported metric encoding format: " << format;
                 break;
diff --git a/library/cpp/monlib/dynamic_counters/encode.h b/library/cpp/monlib/dynamic_counters/encode.h
index c79964d7cb..bc39fc0029 100644
--- a/library/cpp/monlib/dynamic_counters/encode.h
+++ b/library/cpp/monlib/dynamic_counters/encode.h
@@ -10,6 +10,7 @@ namespace NMonitoring {
     THolder<ICountableConsumer> CreateEncoder(
         IOutputStream* out,
         EFormat format,
+        TStringBuf nameLabel = "sensor",
         TCountableBase::EVisibility visibility = TCountableBase::EVisibility::Public
     );
 
diff --git a/library/cpp/monlib/dynamic_counters/page.cpp b/library/cpp/monlib/dynamic_counters/page.cpp
index 5124a47bb3..b116adfdef 100644
--- a/library/cpp/monlib/dynamic_counters/page.cpp
+++ b/library/cpp/monlib/dynamic_counters/page.cpp
@@ -31,6 +31,7 @@ void TDynamicCountersPage::Output(NMonitoring::IMonHttpRequest& request) {
         OutputCallback();
     }
 
+    TString nameLabel("sensor");
     TCountableBase::EVisibility visibility{
         TCountableBase::EVisibility::Public
     };
@@ -46,6 +47,15 @@ void TDynamicCountersPage::Output(NMonitoring::IMonHttpRequest& request) {
         parts.pop_back();
     }
 
+    if (!parts.empty() && parts.back().StartsWith(TStringBuf("name_label="))) {
+        TVector<TString> labels;
+        StringSplitter(parts.back()).Split('=').SkipEmpty().Collect(&labels);
+        if (labels.size() == 2U) {
+            nameLabel = labels.back();
+        }
+        parts.pop_back();
+   }
+
     if (!parts.empty() && parts.back() == TStringBuf("private")) {
         visibility = TCountableBase::EVisibility::Private;
         parts.pop_back();
@@ -90,7 +100,7 @@ void TDynamicCountersPage::Output(NMonitoring::IMonHttpRequest& request) {
         ythrow yexception() << "unsupported metric encoding format: " << *format;
     }
 
-    auto encoder = CreateEncoder(&out, *format, visibility);
+    auto encoder = CreateEncoder(&out, *format, nameLabel, visibility);
     counters->Accept(TString(), TString(), *encoder);
     out.Flush();
 }