Further reduce statsd memory usage.

+ Remove the protobuf *Metric object from MetricProducers
   -- This saves ~150 bytes per metric.
+ Remove the StatsdConfig from ConfigManager
   -- This saves us xKB per config.
+ Also remove alerts from fake config to avoid crash (Bug: 70627390)
+ Other misc fixes too.

Test: statsd_test & manual
Change-Id: Ied4eb3fa31c50599817b3a5e1caf5077c487fad2
diff --git a/cmds/statsd/src/metrics/MetricsManager.cpp b/cmds/statsd/src/metrics/MetricsManager.cpp
index b0f0135..3d0e20c 100644
--- a/cmds/statsd/src/metrics/MetricsManager.cpp
+++ b/cmds/statsd/src/metrics/MetricsManager.cpp
@@ -50,11 +50,6 @@
                              mAllMetricProducers, mAllAnomalyTrackers, mConditionToMetricMap,
                              mTrackerToMetricMap, mTrackerToConditionMap);
 
-    // TODO: add alert size.
-    // no matter whether this config is valid, log it in the stats.
-    StatsdStats::getInstance().noteConfigReceived(key, mAllMetricProducers.size(),
-                                                  mAllConditionTrackers.size(),
-                                                  mAllAtomMatchers.size(), 0, mConfigValid);
     // Guardrail. Reject the config if it's too big.
     if (mAllMetricProducers.size() > StatsdStats::kMaxMetricCountPerConfig ||
         mAllConditionTrackers.size() > StatsdStats::kMaxConditionCountPerConfig ||
@@ -62,6 +57,12 @@
         ALOGE("This config is too big! Reject!");
         mConfigValid = false;
     }
+
+    // TODO: add alert size.
+    // no matter whether this config is valid, log it in the stats.
+    StatsdStats::getInstance().noteConfigReceived(key, mAllMetricProducers.size(),
+                                                  mAllConditionTrackers.size(),
+                                                  mAllAtomMatchers.size(), 0, mConfigValid);
 }
 
 MetricsManager::~MetricsManager() {