Support metircIntervalSeconds backward compatibility (#2893)

#2875

---------

Co-authored-by: Trask Stalnaker <[email protected]>

Author: heyams

agent/agent-tooling/src/main/java/com/microsoft/applicationinsights/agent/internal/configuration/Configuration.java

@@ -303,7 +303,8 @@ public static class PreviewConfiguration {
     // this is just here to detect if using this old setting in order to give a helpful message
     @Deprecated public boolean openTelemetryApiSupport;
     public PreviewInstrumentation instrumentation = new PreviewInstrumentation();
-    // this is just here to detect if using this old setting in order to give a helpful message
+    // these are just here to detect if using this old setting in order to give a helpful message
+    @Deprecated public int metricIntervalSeconds = 60;
     @Deprecated public Boolean ignoreRemoteParentNotSampled;
     public boolean captureControllerSpans;
     // this is just here to detect if using this old setting in order to give a helpful message

agent/agent-tooling/src/main/java/com/microsoft/applicationinsights/agent/internal/configuration/ConfigurationBuilder.java

@@ -99,6 +99,10 @@ public class ConfigurationBuilder {
   private static final String APPLICATIONINSIGHTS_PREVIEW_PROFILER_ENABLEDIAGNOSTICS =
       "APPLICATIONINSIGHTS_PREVIEW_PROFILER_ENABLEDIAGNOSTICS";
 
+  @Deprecated
+  private static final String APPLICATIONINSIGHTS_PREVIEW_METRIC_INTERVAL_SECONDS =
+      "APPLICATIONINSIGHTS_PREVIEW_METRIC_INTERVAL_SECONDS";
+
   private static final String APPLICATIONINSIGHTS_METRIC_INTERVAL_SECONDS =
       "APPLICATIONINSIGHTS_METRIC_INTERVAL_SECONDS";
 
@@ -149,6 +153,13 @@ private static void logConfigurationWarnings(Configuration config) {
           "\"openTelemetryApiSupport\" is no longer in preview and it is now the"
               + " (one and only) default behavior");
     }
+    if (config.preview.metricIntervalSeconds != 60) {
+      configurationLogger.warn(
+          "\"metricIntervalSeconds\" is no longer in preview and it has been GA since 3.4.9");
+      if (config.metricIntervalSeconds == 60) {
+        config.metricIntervalSeconds = config.preview.metricIntervalSeconds;
+      }
+    }
     if (config.preview.instrumentation.azureSdk.enabled) {
       configurationLogger.warn(
           "\"azureSdk\" instrumentation is no longer in preview"
@@ -557,9 +568,21 @@ static void overlayFromEnv(Configuration config, Path baseDir) throws IOExceptio
         overlayWithEnvVar(
             APPLICATIONINSIGHTS_SELF_DIAGNOSTICS_FILE_PATH, config.selfDiagnostics.file.path);
 
-    config.metricIntervalSeconds =
-        overlayWithEnvVar(
-            APPLICATIONINSIGHTS_METRIC_INTERVAL_SECONDS, config.metricIntervalSeconds);
+    String deprecatedMetricIntervalSeconds =
+        getEnvVar(APPLICATIONINSIGHTS_PREVIEW_METRIC_INTERVAL_SECONDS);
+    String metricIntervalSeconds = getEnvVar(APPLICATIONINSIGHTS_METRIC_INTERVAL_SECONDS);
+    if (metricIntervalSeconds != null) {
+      config.metricIntervalSeconds =
+          overlayWithEnvVar(
+              APPLICATIONINSIGHTS_METRIC_INTERVAL_SECONDS, config.metricIntervalSeconds);
+    } else if (deprecatedMetricIntervalSeconds != null) {
+      configurationLogger.warn(
+          "\"APPLICATIONINSIGHTS_PREVIEW_METRIC_INTERVAL_SECONDS\" has been renamed to \"APPLICATIONINSIGHTS_METRIC_INTERVAL_SECONDS\""
+              + " in 3.4.9 (GA)");
+      config.metricIntervalSeconds =
+          overlayWithEnvVar(
+              APPLICATIONINSIGHTS_PREVIEW_METRIC_INTERVAL_SECONDS, config.metricIntervalSeconds);
+    }
 
     config.preview.instrumentation.springIntegration.enabled =
         overlayWithEnvVar(