Improve messages in case of DataSource health check failure.

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/jdbc/DataSourceHealthContributorAutoConfiguration.java

@@ -18,6 +18,7 @@
 
 import java.util.Collection;
 import java.util.Map;
+import java.util.Map.Entry;
 import java.util.stream.Collectors;
 
 import javax.sql.DataSource;
@@ -64,12 +65,15 @@
 public class DataSourceHealthContributorAutoConfiguration extends
 		CompositeHealthContributorConfiguration<AbstractHealthIndicator, DataSource> implements InitializingBean {
 
+	private Map<String, DataSource> dataSources;
+
 	private final Collection<DataSourcePoolMetadataProvider> metadataProviders;
 
 	private DataSourcePoolMetadataProvider poolMetadataProvider;
 
 	public DataSourceHealthContributorAutoConfiguration(Map<String, DataSource> dataSources,
 			ObjectProvider<DataSourcePoolMetadataProvider> metadataProviders) {
+		this.dataSources = dataSources;
 		this.metadataProviders = metadataProviders.orderedStream().collect(Collectors.toList());
 	}
 
@@ -89,7 +93,12 @@ protected AbstractHealthIndicator createIndicator(DataSource source) {
 		if (source instanceof AbstractRoutingDataSource) {
 			return new RoutingDataSourceHealthIndicator();
 		}
-		return new DataSourceHealthIndicator(source, getValidationQuery(source));
+		String name = this.dataSources.entrySet().stream()
+				.filter(entry -> entry.getValue().equals(source))
+				.findAny()
+				.map(Entry::getKey)
+				.orElse(null);
+		return new DataSourceHealthIndicator(name, source, getValidationQuery(source));
 	}
 
 	private String getValidationQuery(DataSource source) {

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/jdbc/DataSourceHealthIndicator.java

@@ -82,7 +82,18 @@ public DataSourceHealthIndicator(DataSource dataSource) {
 	 * @param query the validation query to use (can be {@code null})
 	 */
 	public DataSourceHealthIndicator(DataSource dataSource, String query) {
-		super("DataSource health check failed");
+		this(null, dataSource, query);
+	}
+
+	/**
+	 * Create a new {@link DataSourceHealthIndicator} using the specified
+	 * {@link DataSource} and validation query.
+	 * @param name the name of the data source
+	 * @param dataSource the data source
+	 * @param query the validation query to use (can be {@code null})
+	 */
+	public DataSourceHealthIndicator(String name, DataSource dataSource, String query) {
+		super(ex -> "DataSource " + name + " health check failed : " + ex.getMessage());
 		this.dataSource = dataSource;
 		this.query = query;
 		this.jdbcTemplate = (dataSource != null) ? new JdbcTemplate(dataSource) : null;