sch-UID2-6221 added metrics for salts effective timestamp (#2397)

* added metrics for salts effective timestamp

* updated shared version to snapshot

* upgraded shared to 11.4.12

Author: sophia-chen-ttd

pom.xml

@@ -23,7 +23,7 @@
         <enclave-aws.version>2.1.0</enclave-aws.version>
         <enclave-azure.version>2.1.19</enclave-azure.version> 
         <enclave-gcp.version>2.1.9</enclave-gcp.version> 
-        <uid2-shared.version>11.4.4</uid2-shared.version>
+        <uid2-shared.version>11.4.12</uid2-shared.version>
         <image.version>${project.version}</image.version>
         <maven.compiler.source>21</maven.compiler.source>
         <maven.compiler.target>21</maven.compiler.target>

src/main/java/com/uid2/operator/monitoring/OperatorMetrics.java

@@ -35,6 +35,11 @@ public void setup() {
                             .map(SaltEntry::lastUpdated).min(Long::compare).orElse(null))
                 .description("max last updated timestamp within currently effective second level salts")
                 .register(globalRegistry);
+        Gauge
+                .builder("uid2_second_level_salt_current_effective", () ->
+                        saltProvider.getSnapshot(Instant.now()).getEffective().toEpochMilli())
+                .description("effective timestamp of the currently effective second level salts")
+                .register(globalRegistry);
 
         update();
     }