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feat: emit MDCUtils.NO_NAMESPACE value when namespace is null #3186

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Merged
metacosm merged 2 commits into from
Feb 26, 2026
Merged

feat: emit MDCUtils.NO_NAMESPACE value when namespace is null #3186

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f81639e
feat: emit MDCUtils.NO_NAMESPACE value when namespace is null
metacosm Feb 25, 2026
7e69606
fix: improve wording
metacosm Feb 25, 2026
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7 changes: 7 additions & 0 deletions docs/content/en/docs/documentation/observability.md
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,13 @@ For `InformerEventSource` and `ControllerEventSource` the following information
| `eventsource.event.action` | action name (e.g. `ADDED`, `UPDATED`, `DELETED`) |
| `eventsource.name` | name of the event source |

### Note on null values

If a resource doesn't provide values for one of the specified keys, the key will be omitted and not added to the MDC
context. There is, however, one notable exception: the resource's namespace, where, instead of omitting the key, we emit
the `MDCUtils.NO_NAMESPACE` value instead. This allows searching for resources without namespace (notably, clustered
resources) in the logs more easily.

### Disabling MDC support

MDC support is enabled by default. If you want to disable it, you can set the `JAVA_OPERATOR_SDK_USE_MDC` environment
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12 changes: 6 additions & 6 deletions operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/MDCUtils.java
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Expand Up @@ -23,6 +23,7 @@
import io.javaoperatorsdk.operator.processing.event.source.ResourceAction;

public class MDCUtils {
public static final String NO_NAMESPACE = "no namespace";

private static final String NAME = "resource.name";
private static final String NAMESPACE = "resource.namespace";
Expand All @@ -31,20 +32,18 @@ public class MDCUtils {
private static final String RESOURCE_VERSION = "resource.resourceVersion";
private static final String GENERATION = "resource.generation";
private static final String UID = "resource.uid";
private static final String NO_NAMESPACE = "no namespace";
private static final boolean enabled =
Utils.getBooleanFromSystemPropsOrDefault(Utils.USE_MDC_ENV_KEY, true);

private static final String EVENT_SOURCE_PREFIX = "eventsource.event.";
private static final String EVENT_ACTION = EVENT_SOURCE_PREFIX + "action";
private static final String EVENT_SOURCE_NAME = "eventsource.name";
private static final String UNKNOWN_ACTION = "unknown action";

public static void addInformerEventInfo(
HasMetadata resource, ResourceAction action, String eventSourceName) {
if (enabled) {
addResourceInfo(resource, true);
MDC.put(EVENT_ACTION, action == null ? UNKNOWN_ACTION : action.name());
MDC.put(EVENT_ACTION, action.name());
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Copilot AI Feb 25, 2026

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addInformerEventInfo previously handled a null action (falling back to an "unknown" value). With the new MDC.put(EVENT_ACTION, action.name()), passing a null action will now throw an NPE before MDC is populated. Consider restoring the null handling (or enforcing non-null via validation/annotations) to avoid a behavioral regression in this public utility method.

Suggested change
MDC.put(EVENT_ACTION, action.name());
MDC.put(EVENT_ACTION, action != null ? action.name() : "unknown");

Copilot uses AI. Check for mistakes.
MDC.put(EVENT_SOURCE_NAME, eventSourceName);
}
}
Expand Down Expand Up @@ -92,9 +91,10 @@ public static void addResourceInfo(HasMetadata resource, boolean forEventSource)
final var metadata = resource.getMetadata();
if (metadata != null) {
MDC.put(key(NAME, forEventSource), metadata.getName());
if (metadata.getNamespace() != null) {
MDC.put(key(NAMESPACE, forEventSource), metadata.getNamespace());
}

final var namespace = metadata.getNamespace();
MDC.put(key(NAMESPACE, forEventSource), namespace != null ? namespace : NO_NAMESPACE);

MDC.put(key(RESOURCE_VERSION, forEventSource), metadata.getResourceVersion());
if (metadata.getGeneration() != null) {
MDC.put(key(GENERATION, forEventSource), metadata.getGeneration().toString());
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