Add the MAL functions tests back.

[wankai123]

No description provided.

[Copilot]

Pull request overview

This PR reintroduces a suite of MAL (Meter Analysis Language) / meter-analyzer v2 DSL unit tests to validate core parsing + execution semantics (aggregation, arithmetic, filters, scoping, k8s retagging, counters), and adds clarifying guidance in the default application.yml about JDBC credential handling and config masking.

Changes:

• Add back multiple JUnit 5 parameterized tests covering meter-analyzer v2 DSL/MAL functions and counter window behavior.
• Add targeted tests for Kubernetes metadata retagging and process ID generation scenarios.
• Document recommended JDBC URL credential placement and how to mask jdbcUrl in config dump output.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
oap-server/server-starter/src/main/resources/application.yml	Adds guidance to avoid embedding DB credentials in JDBC URLs and notes config-dump masking support.
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/ValueFilterTest.java	Adds parameterized tests for value-based filtering DSL functions.
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/TagFilterTest.java	Adds parameterized tests for tag-based filtering DSL functions.
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/ScopeTest.java	Adds scope/entity mapping tests for service/endpoint/instance/relation scoping.
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/K8sTagTest.java	Adds k8s meta retagging and IP→name virtual process tagging tests with mocked k8s registries.
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/IncreaseTest.java	Adds increase/rate/irate behavior tests using CounterWindow.
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/FunctionTest.java	Adds tests for tag mutation, histogram conversion, and forEach DSL functions (including negative parse cases).
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/FilterTest.java	Adds tests for FilterExpression (rule-level MAL filter closures).
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/DecorateTest.java	Adds a test for the decorate DSL function on MeterEntity.
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/counter/CounterWindowTest.java	Adds unit tests validating counter-window increase calculations across durations.
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/BasicTest.java	Adds baseline parse/run tests for empty and single-sample families.
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/ArithmeticTest.java	Adds parameterized tests for scalar/family arithmetic operations and empty-handling.
oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/AggregationTest.java	Adds aggregation tests, including v2 grammar negative cases for total aggregation.

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[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated no new comments.

Suppressed comments (1)

oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/v2/dsl/IncreaseTest.java:47

• In this test data, Sample.builder() sets the metric name twice (both at the start and again before build()). This is redundant and makes the test data harder to read/maintain. Consider setting the name only once (the other tests in this package usually set it once near the end of the chain) and applying the same cleanup to the rest of IncreaseTest.

                        Sample.builder().name("http_success_request").labels(of("svc", "product"))
                              .timestamp(parse("2020-09-11T11:11:01.00Z").toEpochMilli()).value(50).name("http_success_request").build(),
                        Sample.builder().name("http_success_request").labels(of("svc", "catalog"))
                              .timestamp(parse("2020-09-11T11:11:01.00Z").toEpochMilli()).value(150).name("http_success_request").build()