dt-obs-kubernetes

Infrastructure Kubernetes

Monitor and analyze Kubernetes infrastructure using Dynatrace DQL. Query cluster resources, monitor workload health, analyze pod placement, optimize costs, and assess security posture.

When to Use This Skill

• Monitoring Kubernetes cluster health and capacity
• Analyzing pod and container resource utilization
• Investigating pod failures, OOMKills, evictions, or crash loops
• Debugging degraded deployments, stuck rollouts, or node pressure
• Optimizing Kubernetes resource costs
• Assessing security posture and compliance
• Troubleshooting workload scheduling and placement
• Auditing ingress routing and network policies

Knowledge Base Structure

Core Monitoring (Start Here)

1. Cluster Inventory → references/cluster-inventory.md - Clusters, namespaces, resource distribution
2. Node Monitoring - Node capacity, CPU/memory usage, pod density
3. Pod Monitoring - Pod CPU, memory, lifecycle events
4. Workload Monitoring - Deployment, StatefulSet, DaemonSet resources

Advanced Topics

1. Configuration Analysis → references/labels-annotations.md - Parse k8s.object, labels, annotations
2. Scheduling & Placement → references/pod-node-placement.md - Node selectors, affinity, taints, HA
3. Cost Optimization - Right-sizing, waste detection, efficiency scoring
4. Security & Compliance - Privileged containers, security contexts

Key Concepts

Entity Types

Workloads: K8S_DEPLOYMENT, K8S_STATEFULSET, K8S_DAEMONSET, K8S_JOB, K8S_CRONJOB, K8S_HORIZONTALPODAUTOSCALER
Infrastructure: K8S_CLUSTER, K8S_NAMESPACE, K8S_NODE, K8S_POD
Configuration: K8S_SERVICE, K8S_CONFIGMAP, K8S_SECRET, K8S_PERSISTENTVOLUMECLAIM, K8S_PERSISTENTVOLUME, K8S_INGRESS, K8S_NETWORKPOLICY

Query Types

smartscapeNodes - Query K8s entities:

smartscapeNodes K8S_POD
| filter k8s.namespace.name == "production"
| fields k8s.cluster.name, k8s.pod.name

timeseries - Monitor metrics over time:

timeseries cpu = sum(dt.kubernetes.container.cpu_usage),

fetch logs - Analyze log events:

Core Fields

• k8s.cluster.name, k8s.namespace.name, k8s.pod.name, k8s.node.name
• k8s.workload.name, k8s.workload.kind, k8s.container.name
• k8s.object - Full JSON configuration for deep inspection
• tags[label] - Access labels and annotations

Available Metrics

CPU: dt.kubernetes.container.cpu_usage, cpu_throttled, limits_cpu, requests_cpu
Memory: dt.kubernetes.container.memory_working_set, limits_memory, requests_memory
Operations: dt.kubernetes.container.restarts, oom_kills
Node: dt.kubernetes.node.pods_allocatable, cpu_allocatable, memory_allocatable, dt.kubernetes.pods

Entity Disambiguation

K8S_POD vs CONTAINER: these are different entity types in Dynatrace.

• K8S_POD — K8s-native entities with k8s.object JSON, scheduling state, conditions, and K8s metrics. Use this skill.
• CONTAINER — Host-level container inventory (image, lifetime, host assignment). Use dt-obs-hosts skill instead.

The smartscape edge is CONTAINER --(is_part_of)--> K8S_POD. To reach containers from a pod, traverse backward:

Service → K8S_POD Correlation

No direct smartscape edge exists between SERVICE and K8S_POD. The correlation key is the shared dimension k8s.workload.name. See Service → Pod Drill-Down in references/pod-debugging.md for the full two-step pattern.

Common Workflows

1. Cluster Health Check

List all clusters:

Check node capacity:

Identify pods in non-Running state:

2. Resource Optimization

Find over-provisioned pods (usage < 30%):

Identify containers without limits:

3. Troubleshooting Pod Issues

Pod troubleshooting benefits from combining metrics (timeseries) with Kubernetes events (event stream) for a complete picture.

Metrics-Based Troubleshooting

Find pods with OOMKills:

Analyze pod restart patterns:

Event-Based Troubleshooting

For operational events (pod restarts, OOM kills, evictions, scheduling failures), Kubernetes events provide richer context than metrics alone — including event reasons, messages, and timestamps.

When to use Kubernetes events over metrics:

• User asks about recent operational events ("show me pod restart events")
• User wants event details like reasons and messages
• User asks about events in a specific time window ("last 48 hours")
• User wants to correlate events with root causes

Kubernetes events are available through the get-events-for-kubernetes-cluster tool. Prefer this tool when the user asks about OOM events, pod restarts, evictions, or cluster-wide event history.

Important: distinguish event types when filtering results. Kubernetes events cover many categories. When the user asks about a specific event type, filter the results accordingly — do not report unrelated events:

For a complete answer, combine both approaches:

1. Use the events tool to get the event details (what happened, when, why)
2. Use timeseries metrics to show the quantitative impact (how many restarts, OOM kill counts over time)

Fetch Kubernetes Events via DQL

Pod restart and operational events can also be queried via DQL from the events table:

Filter for specific event reasons:

Field names in fetch events: Use event.reason and event.message — not dt.kubernetes.event.reason. The dt.kubernetes.* prefix is for timeseries metrics, not the events table. Queries using the wrong prefix return zero results.

4. Security Assessment

Identify privileged containers:

Find containers running as root:

5. Scheduling Analysis

Verify pod distribution (HA compliance):

6. DAVIS Problems affecting K8s Entities

Find active DAVIS problems affecting K8s entities:

smartscape.affected_entities is a record array; each record has id, type, and name. Use [][id] to get the array of Smartscape IDs to look up the affected entity, or [id] after expand smartscape.affected_entities. Without a preceding expand, [id] returns null silently. A filter cannot take a bare iterative expression, so wrap it in iAny(...).

Best Practices

Choosing the Right Data Source

Query Performance

1. Filter early - Apply cluster/namespace filters immediately
2. Use specific entity types - Avoid wildcards
3. Limit result sets - Use limit for exploration
4. Cache cluster lists - Store in variables

Monitoring Recommendations

1. Set resource limits on all containers
2. Monitor OOMKills and adjust memory limits
3. Track CPU throttling and adjust CPU limits
4. Review resource efficiency regularly (target 70-80%)
5. Implement security best practices (non-root, read-only filesystem)
6. Use specific image tags (avoid :latest)

Configuration Standards

1. Use labels for organization (app, environment, team)
2. Set resource requests and limits
3. Configure health checks (liveness/readiness probes)
4. Use TLS for all ingress resources
5. Document with annotations

Troubleshooting

Limitations

Unavailable Metrics:

• Pod network metrics (rx_bytes, tx_bytes) are NOT available in Grail
• Workaround: Use service mesh metrics or host-level network metrics

Query Considerations:

• Minimize result set size: Do not include the k8s.object field if not necessary
• Keep result set as simple as possible: Parsing k8s.object increases query complexity
• Large clusters may require pagination or time-range limits
• Some K8s status fields update asynchronously

When to Load References

Load cluster-inventory.md when:

• Performing cluster, namespace, or resource distribution analysis
• Auditing workload counts across clusters

→ references/cluster-inventory.md

Load labels-annotations.md when:

• Filtering by labels or annotations
• Parsing k8s.object for detailed configuration inspection

→ references/labels-annotations.md

Load pod-node-placement.md when:

• Analyzing scheduling constraints (affinity, taints, tolerations)
• Verifying HA compliance and pod distribution

→ references/pod-node-placement.md

Load pod-debugging.md when:

• Investigating pod exit codes, crash loops, or init container failures
• Diagnosing image pull errors or service-to-pod connectivity issues
• Drilling down from a service problem to pod-level details

→ references/pod-debugging.md

Load workload-health.md when:

• Investigating degraded deployments or stuck rollouts
• Checking node conditions, CPU throttling, or HPA scaling
• Analyzing StatefulSet ordering or DaemonSet coverage

→ references/workload-health.md

Load pv-pvc.md when:

• Working with persistent storage (PVC/PV lifecycle, orphaned volumes)
• Checking StorageClass configurations

→ references/pv-pvc.md

Load ingress.md when:

• Analyzing ingress routing rules or TLS certificates
• Auditing ingress controller configurations

→ references/ingress.md

Load network-policies.md when:

• Listing or auditing network policies
• Checking namespace isolation configurations

→ references/network-policies.md

References

• cluster-inventory.md — Cluster, namespace, and resource distribution analysis
• labels-annotations.md — Label/annotation filtering and k8s.object parsing
• pod-node-placement.md — Scheduling, affinity, taints, and HA patterns
• pod-debugging.md — Exit codes, pod conditions, init containers, image pull errors, logs, service-to-pod drill-down
• workload-health.md — Degraded deployments, stuck rollouts, node conditions, CPU throttling, HPA, StatefulSet ordering
• pv-pvc.md — PVC/PV lifecycle, phase reference, orphaned volumes, StorageClass
• ingress.md — Routing rule parsing, TLS audit
• network-policies.md — Policy listing, namespace isolation audit

Related Skills

• dt-obs-problems — For problems associated with Kubernetes clusters (use dt.smartscape_source.id with K8S_ prefix filters)
• dt-dql-essentials — Core DQL syntax and query structure
• dt-obs-hosts — Host-level metrics for K8s nodes_