X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=metrics.cpp;h=86c3d591872a4a38d53d34a55216b66e4d6d1405;hb=ffd68fbfb90242069af957f2a28908f0559f8348;hp=eae1e25158c0ec7233bdfd7737b5df7321320217;hpb=209e6be93c4157a6503c82d56e8bc47955f5be6e;p=nageru

diff --git a/metrics.cpp b/metrics.cpp
index eae1e25..86c3d59 100644
--- a/metrics.cpp
+++ b/metrics.cpp
@@ -317,7 +317,13 @@ string Summary::serialize(Metrics::Laziness laziness, const string &name, const
 		vector<pair<string, string>> quantile_labels = labels;
 		quantile_labels.emplace_back("quantile", quantile_ss.str());
 
-		ss << Metrics::serialize_name(name, quantile_labels) << " " << quantile_and_value.second << "\n";
+		double val = quantile_and_value.second;;
+		if (isnan(val)) {
+			// Prometheus can't handle “-nan”.
+			ss << Metrics::serialize_name(name, quantile_labels) << " NaN\n";
+		} else {
+			ss << Metrics::serialize_name(name, quantile_labels) << " " << val << "\n";
+		}
 	}
 
 	ss << Metrics::serialize_name(name + "_sum", labels) << " " << sum.load() << "\n";