Bug fixes for APEX PDP metrics

1. APEX engine metrics were being initialized to 0 in the
constructor which caused them to reset to 0. Hence, initialization
is removed, and updates are done to metrics only upon:
engineStart/Stop, executionEnter/Exit stages.
2. APEX engine Uptime was only updated when engine stopped,
hence always 0. Also, uptime is redundant since it can be derived
from lastStart timestamp and hence is removed as a metric.
3. Fixed a corner case bug which occurs when all
policies are undeployed the counters are not correct.
4. Fix Unit tests

Issue-ID: POLICY-4044
Signed-off-by: Rashmi Pujar <rashmi.pujar1@bell.ca>
Change-Id: I4d875ff288cf8c242a1851eb105e56dc69b97883

1 files changed, 5 insertions, 34 deletions

diff --git a/model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineStats.java b/model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineStats.java
index 1420d1e0d..42a5ef785 100644
--- a/model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineStats.java
+++ b/model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineStats.java
@@ -50,10 +50,7 @@ public class AxEngineStats extends AxConcept {
     static final Gauge ENGINE_EVENT_EXECUTIONS = Gauge.build().name("engine_event_executions")
         .namespace(PrometheusUtils.PdpType.PDPA.getNamespace()).labelNames(ENGINE_INSTANCE_ID)
         .help("Total number of APEX events processed by the engine.").register();
-    static final Gauge ENGINE_UPTIME = Gauge.build().name("engine_uptime")
-        .namespace(PrometheusUtils.PdpType.PDPA.getNamespace()).labelNames(ENGINE_INSTANCE_ID)
-        .help("Time elapsed since the engine was started.").register();
-    static final Gauge ENGINE_START_TIMESTAMP = Gauge.build().name("engine_last_start_timestamp_epoch")
+    static final Gauge ENGINE_LAST_START_TIMESTAMP = Gauge.build().name("engine_last_start_timestamp_epoch")
         .namespace(PrometheusUtils.PdpType.PDPA.getNamespace()).labelNames(ENGINE_INSTANCE_ID)
         .help("Epoch timestamp of the instance when engine was last started.").register();
     static final Gauge ENGINE_AVG_EXECUTION_TIME = Gauge.build().name("engine_average_execution_time_seconds")
@@ -87,22 +84,6 @@ public class AxEngineStats extends AxConcept {
         upTime = 0;
         lastEnterTime = 0;
         lastStart = 0;
-        initEngineMetricsWithPrometheus();
-    }
-
-    /**
-     * Register the APEX engine metrics with Prometheus.
-     */
-    private void initEngineMetricsWithPrometheus() {
-        var engineId = getKey().getParentArtifactKey().getId();
-        if (engineId.startsWith(AxKey.NULL_KEY_NAME)) {
-            return;
-        }
-        ENGINE_UPTIME.labels(engineId).set(upTime / 1000d);
-        ENGINE_EVENT_EXECUTIONS.labels(engineId).set(this.eventCount);
-        ENGINE_START_TIMESTAMP.labels(engineId).set(this.lastStart);
-        ENGINE_AVG_EXECUTION_TIME.labels(engineId).set(this.averageExecutionTime / 1000d);
-        ENGINE_LAST_EXECUTION_TIME.labels(engineId).observe(this.lastExecutionTime / 1000d);
     }
 
     /**
@@ -146,7 +127,6 @@ public class AxEngineStats extends AxConcept {
         this.averageExecutionTime = averageExecutionTime;
         this.upTime = upTime;
         this.lastStart = lastStart;
-        initEngineMetricsWithPrometheus();
     }
 
     /**
@@ -218,8 +198,6 @@ public class AxEngineStats extends AxConcept {
      */
     public void setEventCount(final long eventCount) {
         this.eventCount = eventCount;
-        ENGINE_EVENT_EXECUTIONS.labels(getKey().getParentArtifactKey().getId())
-                .set(this.eventCount);
     }
 
     /**
@@ -238,8 +216,6 @@ public class AxEngineStats extends AxConcept {
      */
     public void setLastExecutionTime(final long lastExecutionTime) {
         this.lastExecutionTime = lastExecutionTime;
-        ENGINE_LAST_EXECUTION_TIME.labels(getKey().getParentArtifactKey().getId())
-                .observe(this.lastExecutionTime / 1000d);
     }
 
     /**
@@ -258,8 +234,6 @@ public class AxEngineStats extends AxConcept {
      */
     public void setAverageExecutionTime(final double averageExecutionTime) {
         this.averageExecutionTime = averageExecutionTime;
-        ENGINE_AVG_EXECUTION_TIME.labels(getKey().getParentArtifactKey().getId())
-                .set(this.averageExecutionTime / 1000d);
     }
 
     /**
@@ -281,7 +255,6 @@ public class AxEngineStats extends AxConcept {
      */
     public void setUpTime(final long upTime) {
         this.upTime = upTime;
-        ENGINE_UPTIME.labels(getKey().getParentArtifactKey().getId()).set(this.upTime / 1000d);
     }
 
     /**
@@ -291,7 +264,6 @@ public class AxEngineStats extends AxConcept {
      */
     private void setLastStart(final long lastStart) {
         this.lastStart = lastStart;
-        ENGINE_START_TIMESTAMP.labels(getKey().getParentArtifactKey().getId()).set(this.lastStart);
     }
 
     /**
@@ -314,7 +286,6 @@ public class AxEngineStats extends AxConcept {
         upTime = 0;
         lastEnterTime = 0;
         lastStart = 0;
-        initEngineMetricsWithPrometheus();
     }
 
     /**
@@ -325,12 +296,13 @@ public class AxEngineStats extends AxConcept {
     public synchronized void executionEnter(final AxArtifactKey eventkey) {
         final long now = System.currentTimeMillis();
         eventCount++;
+        ENGINE_EVENT_EXECUTIONS.labels(getKey().getParentArtifactKey().getId()).inc();
         if (eventCount < 0) {
             eventCount = 2;
+            ENGINE_EVENT_EXECUTIONS.labels(getKey().getParentArtifactKey().getId()).set(this.eventCount);
         }
         lastEnterTime = now;
         timeStamp = now;
-        ENGINE_EVENT_EXECUTIONS.labels(getKey().getParentArtifactKey().getId()).set(this.eventCount);
     }
 
     /**
@@ -356,6 +328,7 @@ public class AxEngineStats extends AxConcept {
         final long now = System.currentTimeMillis();
         timeStamp = now;
         this.setLastStart(now);
+        ENGINE_LAST_START_TIMESTAMP.labels(getKey().getParentArtifactKey().getId()).set(this.lastStart);
     }
 
     /**
@@ -366,7 +339,7 @@ public class AxEngineStats extends AxConcept {
         timeStamp = now;
         upTime += (timeStamp - this.getLastStart());
         this.setLastStart(0);
-        ENGINE_UPTIME.labels(getKey().getParentArtifactKey().getId()).set(this.upTime / 1000d);
+        ENGINE_LAST_START_TIMESTAMP.labels(getKey().getParentArtifactKey().getId()).set(this.lastStart);
     }
 
     /**
@@ -432,8 +405,6 @@ public class AxEngineStats extends AxConcept {
         copy.setAverageExecutionTime(averageExecutionTime);
         copy.setUpTime(upTime);
         copy.setLastStart(lastStart);
-        initEngineMetricsWithPrometheus();
-
         return copy;
     }