Statsd guardrail for Alerts

Now, each config is allowed at most 100 Alerts in it.
That is, for each uid, for each config id, the config's alert section
can have at most 100 items in it.

Bug: 73287046
Test: none yet
Change-Id: I2c81bc647627e432337c359c0a76aa3fc08bdd23
diff --git a/cmds/statsd/src/guardrail/StatsdStats.h b/cmds/statsd/src/guardrail/StatsdStats.h
index f254327..7baa5e5 100644
--- a/cmds/statsd/src/guardrail/StatsdStats.h
+++ b/cmds/statsd/src/guardrail/StatsdStats.h
@@ -42,6 +42,7 @@
     const static int kDimensionKeySizeHardLimit = 500;
 
     const static int kMaxConfigCount = 10;
+    const static int kMaxAlertCountPerConfig = 100;
     const static int kMaxConditionCountPerConfig = 200;
     const static int kMaxMetricCountPerConfig = 300;
     const static int kMaxMatcherCountPerConfig = 500;