fixup: adding fallback for old version

Signed-off-by: Simon Schrottner <[email protected]>

Author: aepfli

providers/flagd/src/main/java/dev/openfeature/contrib/providers/flagd/Config.java

@@ -33,6 +33,13 @@ public final class Config {
     static final String DEADLINE_MS_ENV_VAR_NAME = "FLAGD_DEADLINE_MS";
     static final String STREAM_DEADLINE_MS_ENV_VAR_NAME = "FLAGD_STREAM_DEADLINE_MS";
     static final String SOURCE_SELECTOR_ENV_VAR_NAME = "FLAGD_SOURCE_SELECTOR";
+    /**
+     * Environment variable to fetch Provider id.
+     * @deprecated please use {@link #PROVIDER_ID_ENV_VAR_NAME}
+     */
+    @Deprecated(forRemoval = true)
+    static final String SOURCE_PROVIDER_ID_ENV_VAR_NAME = "FLAGD_SOURCE_PROVIDER_ID";
+
     static final String PROVIDER_ID_ENV_VAR_NAME = "FLAGD_PROVIDER_ID";
     static final String OFFLINE_SOURCE_PATH = "FLAGD_OFFLINE_FLAG_SOURCE_PATH";
     static final String OFFLINE_POLL_MS = "FLAGD_OFFLINE_POLL_MS";

providers/flagd/src/main/java/dev/openfeature/contrib/providers/flagd/FlagdOptions.java

@@ -42,7 +42,8 @@ public class FlagdOptions {
 
     // TODO: remove the metadata call entirely after https://github.com/open-feature/flagd/issues/1584
     /**
-     * Disables call to sync.GetMetadata (see: https://buf.build/open-feature/flagd/docs/main:flagd.sync.v1#flagd.sync.v1.FlagSyncService.GetMetadata).
+     * Disables call to sync.GetMetadata (see:
+     * https://buf.build/open-feature/flagd/docs/main:flagd.sync.v1#flagd.sync.v1.FlagSyncService.GetMetadata).
      * Disabling will prevent static context from flagd being used in evaluations.
      * GetMetadata and this option will be removed.
      */
@@ -123,7 +124,8 @@ public class FlagdOptions {
      * ProviderId to be used with flag sync gRPC contract.
      **/
     @Builder.Default
-    private String providerId = fallBackToEnvOrDefault(Config.PROVIDER_ID_ENV_VAR_NAME, null);
+    private String providerId = fallBackToEnvOrDefault(
+            Config.PROVIDER_ID_ENV_VAR_NAME, fallBackToEnvOrDefault(Config.SOURCE_PROVIDER_ID_ENV_VAR_NAME, null));
 
     /**
      * gRPC client KeepAlive in milliseconds. Disabled with 0.