Remove unnecessary shared_from_this on instrument classes

src/telemetry/Counter.h

@@ -63,7 +63,7 @@ private:
 
 using CounterPtr = std::shared_ptr<Counter>;
 
-class CounterFamily : public MetricFamily, public std::enable_shared_from_this<CounterFamily> {
+class CounterFamily : public MetricFamily {
 public:
     static inline const char* OpaqueName = "CounterMetricFamilyVal";
 

src/telemetry/Gauge.h

@@ -81,7 +81,7 @@ private:
 
 using GaugePtr = std::shared_ptr<Gauge>;
 
-class GaugeFamily : public MetricFamily, public std::enable_shared_from_this<GaugeFamily> {
+class GaugeFamily : public MetricFamily {
 public:
     static inline const char* OpaqueName = "GaugeMetricFamilyVal";
 

src/telemetry/Histogram.h

@@ -46,7 +46,7 @@ private:
 
 using HistogramPtr = std::shared_ptr<Histogram>;
 
-class HistogramFamily : public MetricFamily, public std::enable_shared_from_this<HistogramFamily> {
+class HistogramFamily : public MetricFamily {
 public:
     static inline const char* OpaqueName = "HistogramMetricFamilyVal";