Cron monitoring for Java services

One annotation. Then you know.

Marsolen reads the schedule off your @Scheduled method, so it already knows when the next run is due. If the ping does not arrive, the team that owns the job hears about it.

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Free for 5 monitors · no credit card · Boot 3.5 and 4.1

ReportJob.java

@Componentclass ReportJob {   @Scheduled(cron = "0 0 3 * * *", zone = "Europe/Paris")  @MonitoredSchedule("nightly-report")  void generateNightly() {    reports.nightly();  }}

nightly-report Down 42m

44 runs expected 03:00 Europe/Paris

Ingest budget · p99 50ms

Overdue sweep 30s

Ping timeout in your JVM 2s, non-blocking

Dependencies added 0transitive

Two lines in the job you already have

Add the starter once per service. Every annotated method registers itself when your service starts, with its cron expression and zone already known.

Spring Scheduler Quartz Maven Properties

ReportJob.java

1@Component2class ReportJob {3 4  @Scheduled(cron = "0 0 3 * * *", zone = "Europe/Paris")5  @MonitoredSchedule("nightly-report")6  void generateNightly() {7    reports.nightly();8  }9}

ReportQuartzJob.java

1public class ReportQuartzJob implements Job {2 3  @Override4  @MonitoredSchedule("nightly-report")5  public void execute(JobExecutionContext ctx) {6    reports.nightly();7  }8}

pom.xml

1<dependency>2  <groupId>io.marsolen</groupId>3  <artifactId>marsolen-spring-boot-starter</artifactId>4  <version>0.1.0</version>5</dependency>

application.properties

1marsolen.enabled=true2marsolen.base-url=https://marsolen.com3marsolen.timeout=2s

Spring Boot 3.5 and 4.1

Java 17 and up

Quartz and plain cron

Never blocks your job

Three places to be told

Email

Verified addresses only, so an alert cannot land in a mailbox nobody reads.

Webhook

JSON on state change, retried with backoff. Private address ranges are refused.

Slack

One incoming webhook per channel. Down, and again on recovery. Nothing else.

Priced per monitor

Free

$0

Your own jobs, one service.

5 monitors
Email alerts
7-day ping history

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Pro

Most teams

$19/ month

One product team's batch estate.

50 monitors
Email, webhook, Slack
90-day ping history
Grace period per monitor

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Scale

$49/ month

Many services, one bill.

250 monitors
1-year ping history
Per-monitor webhook targets

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