X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=metrics.h;h=d515720ade805b8c4d43eeea23fe23955e7aa819;hb=96cb6414f85e0ef4d660b7bd56267303e80fcd05;hp=0371668bd2a1e25c1adaed613071ac8e3c6c0551;hpb=1836dccf699779d9092a75755cec96cea1734a2a;p=nageru

diff --git a/metrics.h b/metrics.h
index 0371668..d515720 100644
--- a/metrics.h
+++ b/metrics.h
@@ -28,6 +28,10 @@ public:
 		TYPE_GAUGE,
 		TYPE_HISTOGRAM,  // Internal use only.
 	};
+	enum Laziness {
+		PRINT_ALWAYS,
+		PRINT_WHEN_NONEMPTY,
+	};
 
 	void add(const std::string &name, std::atomic<int64_t> *location, Type type = TYPE_COUNTER)
 	{
@@ -46,7 +50,14 @@ public:
 
 	void add(const std::string &name, const std::vector<std::pair<std::string, std::string>> &labels, std::atomic<int64_t> *location, Type type = TYPE_COUNTER);
 	void add(const std::string &name, const std::vector<std::pair<std::string, std::string>> &labels, std::atomic<double> *location, Type type = TYPE_COUNTER);
-	void add(const std::string &name, const std::vector<std::pair<std::string, std::string>> &labels, Histogram *location);
+	void add(const std::string &name, const std::vector<std::pair<std::string, std::string>> &labels, Histogram *location, Laziness laziness = PRINT_ALWAYS);
+
+	void remove(const std::string &name)
+	{
+		remove(name, {});
+	}
+
+	void remove(const std::string &name, const std::vector<std::pair<std::string, std::string>> &labels);
 
 	std::string serialize() const;
 
@@ -78,6 +89,7 @@ private:
 	};
 	struct Metric {
 		DataType data_type;
+		Laziness laziness;  // Only for TYPE_HISTOGRAM.
 		union {
 			std::atomic<int64_t> *location_int64;
 			std::atomic<double> *location_double;
@@ -99,7 +111,7 @@ public:
 	void init_uniform(size_t num_buckets);  // Sets up buckets 0..(N-1).
 	void init_geometric(double min, double max, size_t num_buckets);
 	void count_event(double val);
-	std::string serialize(const std::string &name, const std::vector<std::pair<std::string, std::string>> &labels) const;
+	std::string serialize(Metrics::Laziness laziness, const std::string &name, const std::vector<std::pair<std::string, std::string>> &labels) const;
 
 private:
 	// Bucket <i> counts number of events where val[i - 1] < x <= val[i].