add checkstyle

Signed-off-by: Gregor Zeitlinger <[email protected]>

Author: zeitlinger

checkstyle.xml

@@ -42,9 +42,9 @@
 
   <module name="LineLength">
     <property name="fileExtensions" value="java"/>
-    <property name="max" value="200"/>
+    <property name="max" value="100"/>
     <property name="ignorePattern"
-      value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
+      value="^package.*|^import.*|a href|href|http://|https://|ftp://|# HELP.*|jvm_runtime_info\{"/>
   </module>
 
   <module name="TreeWalker">

examples/example-exporter-opentelemetry/src/main/java/io/prometheus/metrics/examples/opentelemetry/ManualCompleteMetricsTest.java

@@ -59,7 +59,8 @@ public static void main(String[] args) throws Exception {
           histogram.labelValues("200").observe(random.nextGaussian());
       }
 
-      // Explicitly use a classic-only histogram to have an example of a classic histogram in OpenTelemetry
+      // Explicitly use a classic-only histogram to have an example of a classic
+      // histogram in OpenTelemetry
       Histogram classicHistogram = Histogram.newBuilder()
               .withName("request_size_bytes")
               .withHelp("Request size in Bytes")

prometheus-metrics-core/src/main/java/io/prometheus/metrics/core/metrics/StatefulMetric.java

@@ -105,7 +105,8 @@ public D labelValues(String... labelValues) {
             getClass().getSimpleName()
                 + " "
                 + getMetadata().getName()
-                + " was created with label names, so you must call labelValues(...) when using it.");
+                + " was created with label names, so you must call labelValues(...)"
+                + " when using it.");
       } else {
         throw new IllegalArgumentException(
             "Expected " + labelNames.length + " label values, but got " + labelValues.length + ".");

prometheus-metrics-exporter-common/src/main/java/io/prometheus/metrics/exporter/common/PrometheusScrapeHandler.java

@@ -157,7 +157,8 @@ private boolean writeDebugResponse(MetricSnapshots snapshots, PrometheusHttpExch
           body.write(
               ("debug="
                       + debugParam
-                      + ": Unsupported query parameter. Valid values are 'openmetrics', 'text', and 'prometheus-protobuf'.")
+                      + ": Unsupported query parameter. Valid values are 'openmetrics', "
+                      + "'text', and 'prometheus-protobuf'.")
                   .getBytes(StandardCharsets.UTF_8));
           break;
       }

prometheus-metrics-exporter-httpserver/src/main/java/io/prometheus/metrics/exporter/httpserver/HttpExchangeAdapter.java

@@ -120,7 +120,8 @@ private void sendErrorResponseWithStackTrace(Exception requestHandlerException)
         Logger.getLogger(this.getClass().getName())
             .log(
                 Level.SEVERE,
-                "The Prometheus metrics HTTPServer caught an Exception during scrape and failed to send an error response to the client.",
+                "The Prometheus metrics HTTPServer caught an Exception during scrape and "
+                    + "failed to send an error response to the client.",
                 errorWriterException);
         Logger.getLogger(this.getClass().getName())
             .log(
@@ -134,7 +135,8 @@ private void sendErrorResponseWithStackTrace(Exception requestHandlerException)
       Logger.getLogger(this.getClass().getName())
           .log(
               Level.SEVERE,
-              "The Prometheus metrics HTTPServer caught an Exception while trying to send the metrics response.",
+              "The Prometheus metrics HTTPServer caught an Exception while trying to send "
+                  + "the metrics response.",
               requestHandlerException);
     }
   }

prometheus-metrics-instrumentation-dropwizard5/src/main/java/io/prometheus/metrics/instrumentation/dropwizard5/DropwizardExports.java

@@ -196,7 +196,8 @@ MetricSnapshot fromMeter(String dropwizardName, Meter meter) {
   @Override
   public MetricSnapshots collect() {
     MetricSnapshots.Builder metricSnapshots = MetricSnapshots.builder();
-    for (Map.Entry<MetricName, Gauge> entry : registry.getGauges(metricFilter).entrySet()) {
+    for (@SuppressWarnings("rawtypes")
+    Map.Entry<MetricName, Gauge> entry : registry.getGauges(metricFilter).entrySet()) {
       Optional.ofNullable(fromGauge(entry.getKey().getKey(), entry.getValue()))
           .ifPresent(metricSnapshots::metricSnapshot);
     }

prometheus-metrics-instrumentation-jvm/src/main/java/io/prometheus/metrics/instrumentation/jvm/JvmClassLoadingMetrics.java

@@ -67,7 +67,8 @@ private void register(PrometheusRegistry registry) {
     CounterWithCallback.builder(config)
         .name(JVM_CLASSES_UNLOADED_TOTAL)
         .help(
-            "The total number of classes that have been unloaded since the JVM has started execution")
+            "The total number of classes that have been unloaded since the JVM has "
+                + "started execution")
         .callback(callback -> callback.call(classLoadingBean.getUnloadedClassCount()))
         .register(registry);
   }

prometheus-metrics-instrumentation-jvm/src/main/java/io/prometheus/metrics/instrumentation/jvm/JvmMemoryPoolAllocationMetrics.java

@@ -61,7 +61,8 @@ private void register(PrometheusRegistry registry) {
         Counter.builder()
             .name(JVM_MEMORY_POOL_ALLOCATED_BYTES_TOTAL)
             .help(
-                "Total bytes allocated in a given JVM memory pool. Only updated after GC, not continuously.")
+                "Total bytes allocated in a given JVM memory pool. Only updated after GC, "
+                    + "not continuously.")
             .labelNames("pool")
             .register(registry);
 

prometheus-metrics-instrumentation-jvm/src/main/java/io/prometheus/metrics/instrumentation/jvm/JvmNativeMemoryMetrics.java

@@ -110,7 +110,8 @@ private void register(PrometheusRegistry registry) {
       GaugeWithCallback.builder(config)
           .name(JVM_NATIVE_MEMORY_RESERVED_BYTES)
           .help(
-              "Reserved bytes of a given JVM. Reserved memory represents the total amount of memory the JVM can potentially use.")
+              "Reserved bytes of a given JVM. Reserved memory represents the total amount of "
+                  + "memory the JVM can potentially use.")
           .unit(Unit.BYTES)
           .labelNames("pool")
           .callback(makeCallback(true))
@@ -119,7 +120,8 @@ private void register(PrometheusRegistry registry) {
       GaugeWithCallback.builder(config)
           .name(JVM_NATIVE_MEMORY_COMMITTED_BYTES)
           .help(
-              "Committed bytes of a given JVM. Committed memory represents the amount of memory the JVM is using right now.")
+              "Committed bytes of a given JVM. Committed memory represents the amount of "
+                  + "memory the JVM is using right now.")
           .unit(Unit.BYTES)
           .labelNames("pool")
           .callback(makeCallback(false))

prometheus-metrics-instrumentation-jvm/src/main/java/io/prometheus/metrics/instrumentation/jvm/JvmThreadsMetrics.java

@@ -109,7 +109,8 @@ private void register(PrometheusRegistry registry) {
       GaugeWithCallback.builder(config)
           .name(JVM_THREADS_DEADLOCKED)
           .help(
-              "Cycles of JVM-threads that are in deadlock waiting to acquire object monitors or ownable synchronizers")
+              "Cycles of JVM-threads that are in deadlock waiting to acquire object monitors or "
+                  + "ownable synchronizers")
           .callback(
               callback -> callback.call(nullSafeArrayLength(threadBean.findDeadlockedThreads())))
           .register(registry);