Add "ignore transitions" rules

src/main/java/org/hibernate/infra/replicate/jira/JiraConfig.java

@@ -4,6 +4,7 @@
 import java.util.Base64;
 import java.util.Map;
 import java.util.Optional;
+import java.util.Set;
 
 import io.smallrye.config.ConfigMapping;
 import io.smallrye.config.WithDefault;
@@ -293,6 +294,7 @@ interface IssueTypeValueMapping extends ValueMapping {
 		 *         epic-short-label in the upstream (source) Jira instance.
 		 */
 		Optional<String> epicLinkSourceLabelCustomFieldName();
+
 		/**
 		 * @return The name of a custom field that represents the "epic name" i.e.
 		 *         epic-short-label in the downstream (destination) Jira instance.
@@ -312,6 +314,23 @@ interface StatusesValueMapping extends ValueMapping {
 		 *         closing the issue deleted upstream before archiving it.
 		 */
 		Optional<String> deletedTransition();
+
+		/**
+		 * @return A map where the {@code key} is the upstream status name, and the
+		 *         corresponding {@code value} contains the names of the downstream
+		 *         status names. If the downstream issue is currently in one of the
+		 *         statuses present in the value set then the transition for status
+		 *         ({@code key}) should not be applied.
+		 *         <p>
+		 *         This allows both skipping unnecessary transitions
+		 *         {@code "status a" -> "status a" } as well as to keep the downstream
+		 *         issue in the status modified downstream if it is within the "group"
+		 *         of statuses "mapped" to the upstream one. This can be useful when
+		 *         e.g. downstream workflow has both {@code New} and {@code Ready}
+		 *         statuses, and users move new issues to the {@code Ready} status
+		 *         issues downstream, without an override from an upstream updates.
+		 */
+		Map<String, Set<String>> ignoreTransitionCondition();
 	}
 
 	interface UserValueMapping extends ValueMapping {

src/main/java/org/hibernate/infra/replicate/jira/service/jira/handler/JiraIssueAbstractEventHandler.java

@@ -3,8 +3,10 @@
 import java.net.URI;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Locale;
 import java.util.Objects;
 import java.util.Optional;
+import java.util.Set;
 import java.util.regex.Pattern;
 
 import org.hibernate.infra.replicate.jira.JiraConfig;
@@ -28,12 +30,27 @@ public JiraIssueAbstractEventHandler(ReportingConfig reportingConfig, HandlerPro
 	}
 
 	protected void applyTransition(JiraIssue sourceIssue, String destinationKey) {
+		JiraIssue destIssue = context.destinationJiraClient().getIssue(destinationKey);
+		applyTransition(sourceIssue, destIssue, destinationKey);
+	}
+
+	protected void applyTransition(JiraIssue sourceIssue, JiraIssue destIssue, String destinationKey) {
+		Set<String> statusesToIgnore = context.projectGroup().statuses().ignoreTransitionCondition()
+				.getOrDefault(sourceIssue.fields.status.name.toLowerCase(Locale.ROOT).replace(' ', '-'), Set.of());
+		if (statusesToIgnore.contains(destIssue.fields.status.name.toLowerCase(Locale.ROOT))) {
+			// no need to apply the transition :)
+			return;
+		}
 		prepareTransition(sourceIssue).ifPresent(
 				jiraTransition -> context.destinationJiraClient().transition(destinationKey, jiraTransition));
 	}
 
 	protected void updateIssueBody(JiraIssue sourceIssue, String destinationKey) {
 		JiraIssue destIssue = context.destinationJiraClient().getIssue(destinationKey);
+		updateIssueBody(sourceIssue, destIssue, destinationKey);
+	}
+
+	protected void updateIssueBody(JiraIssue sourceIssue, JiraIssue destIssue, String destinationKey) {
 		JiraIssue issue = issueToCreate(sourceIssue, destIssue);
 
 		updateIssue(destinationKey, issue, sourceIssue, context.notMappedAssignee());

src/main/java/org/hibernate/infra/replicate/jira/service/jira/handler/JiraIssueUpsertEventHandler.java

@@ -29,14 +29,16 @@ protected void doRun() {
 		context.createNextPlaceholderBatch(destinationKey);
 
 		try {
-			updateIssueBody(sourceIssue, destinationKey);
+			JiraIssue destIssue = context.destinationJiraClient().getIssue(destinationKey);
+
+			updateIssueBody(sourceIssue, destIssue, destinationKey);
 			// remote "aka web" links cannot be added in the same request and are also not
 			// returned as part of the issue API.
 			// We "upsert" the remote link pointing to the "original/source" issue that
 			// triggered the sync with an additional call:
 			context.destinationJiraClient().upsertRemoteLink(destinationKey, remoteSelfLink(sourceIssue));
 			// issue status can be updated only through transition:
-			applyTransition(sourceIssue, destinationKey);
+			applyTransition(sourceIssue, destIssue, destinationKey);
 			// and then we want to add a link to a parent, if the issue was actually a
 			// sub-task which we've created as a task:
 			prepareParentLink(destinationKey, sourceIssue).ifPresent(context.destinationJiraClient()::upsertIssueLink);