Change the namespace validation for oracle metrics

oraclecloud-micrometer/src/main/java/io/micronaut/oraclecloud/monitoring/micrometer/OracleCloudConfig.java

@@ -111,6 +111,10 @@ default Validated<?> validate() {
                                 "must match pattern '" + NAMESPACE_REGEX + "'",
                                 InvalidReason.MALFORMED);
                     }
+                    if (namespace().startsWith("oci_")) {
+                        return Validated.invalid(prefix() + ".namespace", namespace(),
+                                "cannot start with 'oci_'", InvalidReason.MALFORMED);
+                    }
                     return Validated.valid(prefix() + ".namespace", namespace());
                 });
     }

oraclecloud-micrometer/src/test/groovy/io/micronaut/oraclecloud/monitoring/OracleCloudMeterRegistryFactorySpec.groovy

@@ -20,17 +20,25 @@ class OracleCloudMeterRegistryFactorySpec extends Specification {
     @Shared
     String compartmentOcid = System.getenv("MONITORING_COMPARTMENT_OCID")
 
+    @Shared
+    String configProfile = System.getenv("MONITORING_CONFIG_PROFILE")
+
     def "test it publish metrics to ingestion telemetry endpoint"() {
         given:
 
         def confVariables = [
+                "micronaut.metrics.export.oraclecloud.enabled"        : true,
+                "micronaut.metrics.export.oraclecloud.step"           : "1s",
                 "micronaut.metrics.export.oraclecloud.namespace"      : "micronaut_test",
-                "micronaut.metrics.export.oraclecloud.applicationName": "micronaut_test",
+                "micronaut.metrics.export.oraclecloud.applicationName": "micronaut_test"
         ]
 
         if (compartmentOcid != null && !compartmentOcid.isEmpty()) {
             confVariables["micronaut.metrics.export.oraclecloud.compartmentId"] = compartmentOcid
         }
+        if (configProfile != null && !configProfile.isEmpty()) {
+            confVariables["oci.config.profile"] = configProfile
+        }
 
         ApplicationContext context = ApplicationContext.run(confVariables, Environment.ORACLE_CLOUD)
         OracleCloudMeterRegistry cloudMeterRegistry = context.getBean(OracleCloudMeterRegistry)
@@ -41,7 +49,7 @@ class OracleCloudMeterRegistryFactorySpec extends Specification {
                 description("Testing of micronaut-oraclecloud-monitoring module").
                 register(cloudMeterRegistry)
         counter.increment(5.0)
-        sleep(2000)
+        sleep(6000)
 
         then:
         noExceptionThrown()

oraclecloud-micrometer/src/test/groovy/io/micronaut/oraclecloud/monitoring/micrometer/OracleCloudNamespaceValidationSpec.groovy

@@ -0,0 +1,45 @@
+package io.micronaut.oraclecloud.monitoring.micrometer
+
+import io.micronaut.context.ApplicationContext
+import jakarta.inject.Inject
+import spock.lang.Specification
+
+class OracleCloudNamespaceValidationSpec extends Specification {
+
+    @Inject
+    ApplicationContext context
+
+    def "test valid namespaces"() {
+        given:
+        var pattern = OracleCloudConfig.NAMESPACE_PATTERN
+
+        expect:
+        pattern.matcher(string).matches()
+
+        where:
+        string | _
+        "namespace" | _
+        "namespace123" | _
+        "my_space_123" | _
+        "example_namespace" | _
+    }
+
+    def "test invalid namespaces"() {
+        given:
+        var pattern = OracleCloudConfig.NAMESPACE_PATTERN
+
+        expect:
+        !pattern.matcher(string).matches()
+
+        where:
+        string | _
+        "one&two" | _
+        "-namespace" | _
+        "Namespace%Example" | _
+        "123-my-space" | _
+        "NAMESPACE" | _
+        "example-namespace" | _
+        "EXAMPLE-Namespace-example123" | _
+        "my-space-123" | _
+    }
+}