OTEL_TRACE_CALLTARGET_ENABLED=true by default and truncate integrations.json (#181)

dev/envvars.sh

@@ -50,6 +50,5 @@ export OTEL_EXPORTER_ZIPKIN_ENDPOINT="http://localhost:9411/api/v2/spans"
 export OTEL_TRACE_DEBUG="1"
 export OTEL_EXPORTER="zipkin"
 export OTEL_DUMP_ILREWRITE_ENABLED="0"
-export OTEL_TRACE_CALLTARGET_ENABLED="1"
 export OTEL_CLR_ENABLE_INLINING="1"
 export OTEL_PROFILER_EXCLUDE_PROCESSES="dotnet.exe,dotnet"

src/Datadog.Trace.ClrProfiler.Native/environment_variables_util.h

@@ -47,7 +47,8 @@ bool EnableInlining(bool defaultValue) {
 }
 
 bool IsCallTargetEnabled() {
-  CheckIfTrue(GetEnvironmentValue(environment::calltarget_enabled));
+  ToBooleanWithDefault(GetEnvironmentValue(environment::calltarget_enabled),
+    true);
 }
 
 bool IsDebugEnabled() {