added tracking for profile providers (#3545)

Author: kai-ion

src/aws-cpp-sdk-core/include/aws/core/client/UserAgent.h

@@ -38,6 +38,7 @@ enum class UserAgentFeature {
   CREDENTIALS_IMDS,
   CREDENTIALS_STS_ASSUME_ROLE,
   CREDENTIALS_HTTP,
+  CREDENTIALS_PROFILE_SOURCE_PROFILE,
 };
 
 class AWS_CORE_API UserAgent {

src/aws-cpp-sdk-core/source/client/UserAgent.cpp

@@ -48,6 +48,7 @@ const std::pair<UserAgentFeature, const char*> BUSINESS_METRIC_MAPPING[] = {
     {UserAgentFeature::CREDENTIALS_IMDS, "0"},
     {UserAgentFeature::CREDENTIALS_STS_ASSUME_ROLE, "i"},
     {UserAgentFeature::CREDENTIALS_HTTP, "z"},
+    {UserAgentFeature::CREDENTIALS_PROFILE_SOURCE_PROFILE, "p"},
 };
 
 const std::pair<const char*, UserAgentFeature> RETRY_FEATURE_MAPPING[] = {

src/aws-cpp-sdk-identity-management/source/auth/STSProfileCredentialsProvider.cpp

@@ -295,7 +295,12 @@ void STSProfileCredentialsProvider::Reload()
 
         // get the role arn from the profile at the top of the stack (which hasn't been popped out yet)
         const auto arn = sourceProfiles.back()->second.GetRoleArn();
-        const auto& assumedCreds = GetCredentialsFromSTS(stsCreds, arn);
+        auto assumedCreds = GetCredentialsFromSTS(stsCreds, arn);
+
+        if (!assumedCreds.IsEmpty()) {
+          assumedCreds.AddUserAgentFeature(Aws::Client::UserAgentFeature::CREDENTIALS_PROFILE_SOURCE_PROFILE);
+        }
+
         sourceProfiles.back()->second.SetCredentials(assumedCreds);
     }