3.15.0

public class MyMonitor implements HealthcheckMonitor {
        private static final String QUERY = ""; // some query
        private static final String EVENT_TYPE = ""; //some event type
        private Live.Action queriesHandler;

        @Override
        public void start(@NotNull Live live, @NotNull HealthcheckConfig healthcheckConfig) throws Exception {
            //start monitoring
            String statsEmail = healthcheckConfig.getGeneralStatsRecipient();
            final List<String> statsRecipients = Collections.singletonList(statsEmail);

            QueryListener.Empty listener = new QueryListener.Empty() {
                @Override
                public void onEvent(QueryEvent events, boolean history) throws Exception {
                    if (history) return;

                    Map<String, Object> stats = HealthCheckUtils.loadBaseEvent(live, EVENT_TYPE, HealthCheckUtils::hostNameSupplier);

                    for (Map<String, Object> event : events) {
                        stats.put("key1", event.get("key1"));
                    }

                    String json = LiveJson.toJson(stats);

                    HealthCheckUtils.sendEmailWithAttachments(live, json, statsRecipients);
                }
            };
            Query query = new Query(QUERY)
                    .follow(true)
                    .preloadWindow(true)
                    .description("My monitor query")
                    .listenWith(listener);

            queriesHandler = live.queries().run(query);
        }

        @Override
        public void stop(@NotNull Live live) throws Exception {
            //stop monitoring
            if (queriesHandler != null) {
                queriesHandler.close();
            }
        }
    }

...
    <dependencies>
    ...
        <dependency>
            <groupId>net.intelie.live</groupId>
            <artifactId>plugin-healthcheck</artifactId>
            <version>3.15.0</version>
            <scope>provided</scope>
        </dependency>
        ...
    </dependencies>
...