Remove Java Pushgateway example (#1133)

Signed-off-by: lucperkins <lucperkins@gmail.com>

content/docs/instrumenting/pushing.md

@@ -24,72 +24,3 @@ class.
  * For use from Python see [Exporting to a Pushgateway](https://github.com/prometheus/client_python#exporting-to-a-pushgateway).
 
  * For use from Ruby see the [Pushgateway documentation](https://github.com/prometheus/client_ruby#pushgateway).
-
-## Java batch job example
-
-This example illustrates how to instrument a batch job and alert on it not having succeeded recently.
-
-If using Maven, add the following to `pom.xml`:
-
-```
-        <dependency>
-            <groupId>io.prometheus</groupId>
-            <artifactId>simpleclient</artifactId>
-            <version>0.0.10</version>
-        </dependency>
-        <dependency>
-            <groupId>io.prometheus</groupId>
-            <artifactId>simpleclient_pushgateway</artifactId>
-            <version>0.0.10</version>
-        </dependency>
-```
-
-Instrument your batch job's code:
-
-```java
-import io.prometheus.client.CollectorRegistry;
-import io.prometheus.client.Gauge;
-import io.prometheus.client.exporter.PushGateway;
-
-void executeBatchJob() throws Exception {
- CollectorRegistry registry = new CollectorRegistry();
- Gauge duration = Gauge.build()
-     .name("my_batch_job_duration_seconds")
-     .help("Duration of my batch job in seconds.")
-     .register(registry);
- Gauge.Timer durationTimer = duration.startTimer();
- try {
-   // Your code here.
-
-   // This is only added to the registry after success,
-   // so that a previous success in the Pushgateway is not overwritten on failure.
-   Gauge lastSuccess = Gauge.build()
-       .name("my_batch_job_last_success_unixtime")
-       .help("Last time my batch job succeeded, in unixtime.")
-       .register(registry);
-   lastSuccess.setToCurrentTime();
- } finally {
-   durationTimer.setDuration();
-   PushGateway pg = new PushGateway("127.0.0.1:9091");
-   pg.pushAdd(registry, "my_batch_job");
- }
-}
-```
-
-Set up a Pushgateway and update the host and port in the above code if needed.
-
-Set up an alert to fire if the job has not run recently. Add the following to
-the rules of a Prometheus server that is scraping the Pushgateway:
-
-```
-groups:
-- name: MyBatchJob
-  rules:
-  - alert: MyBatchJobNotCompleted
-    expr: min(time() - my_batch_job_last_success_unixtime{job="my_batch_job"}) > 60 * 60
-    for: 5m
-    labels:
-      severity: page
-    annotations:
-      summary: MyBatchJob has not completed successfully in over an hour
-```