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Merge pull request #97240 from openshift-cherrypick-robot/cherry-pick-97152-to-enterprise-4.16
[enterprise-4.16] OSDOCS-15287 [NETOBSERV] Line breaks for observing-network-traffic.adoc assembly and its includes
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modules/network-observability-RTT-overview.adoc

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:_mod-docs-content-type: CONCEPT
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[id="network-observability-RTT-overview_{context}"]
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= Round-Trip Time
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You can use TCP smoothed Round-Trip Time (sRTT) to analyze network flow latencies. You can use RTT captured from the `fentry/tcp_rcv_established` eBPF hookpoint to read sRTT from the TCP socket to help with the following:
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modules/network-observability-RTT.adoc

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:_mod-docs-content-type: PROCEDURE
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[id="network-observability-RTT_{context}"]
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= Working with RTT tracing
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You can track RTT by editing the `FlowCollector` to the specifications in the following YAML example.
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.Procedure
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- FlowRTT <1>
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----
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<1> You can start tracing RTT network flows by listing the `FlowRTT` parameter in the `spec.agent.ebpf.features` specification list.
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.Verification
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When you refresh the *Network Traffic* page, the *Overview*, *Traffic Flow*, and *Topology* views display new information about RTT:
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.. In the *Traffic Flows* view, you can also expand the side panel to view more information about RTT.
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.Example filtering
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... Click the *Common* filters -> *Protocol*.
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... Click the *Common* filters -> *Protocol*.
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... Filter the network flow data based on *TCP*, *Ingress* direction, and look for *FlowRTT* values greater than 10,000,000 nanoseconds (10ms).
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... Remove the *Protocol* filter.
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... Remove the *Protocol* filter.
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... Filter for *Flow RTT* values greater than 0 in the *Common* filters.
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.. In the *Topology* view, click the Display option dropdown. Then click *RTT* in the *edge labels* drop-down list.

modules/network-observability-configuring-options-overview.adoc

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:_mod-docs-content-type: REFERENCE
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[id="network-observability-configuring-options-overview_{context}"]
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= Configuring advanced options for the Overview view
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You can customize the graphical view by using advanced options. To access the advanced options, click *Show advanced options*. You can configure the details in the graph by using the *Display options* drop-down menu. The options available are as follows:
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* *Scope*: Select to view the components that network traffic flows between. You can set the scope to *Node*, *Namespace*, *Owner*, *Zones*, *Cluster* or *Resource*. *Owner* is an aggregation of resources. *Resource* can be a pod, service, node, in case of host-network traffic, or an unknown IP address. The default value is *Namespace*.
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== Managing panels and display
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You can select the required panels to be displayed, reorder them, and focus on a specific panel. To add or remove panels, click *Manage panels*.
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The following panels are shown by default:
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The following panels are shown by default:
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* *Top X average bytes rates*
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* *Top X bytes rates stacked with total*

modules/network-observability-configuring-options-topology.adoc

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:_mod-docs-content-type: REFERENCE
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[id="network-observability-configuring-options-topology_{context}"]
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= Configuring the advanced options for the Topology view
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You can customize and export the view by using *Show advanced options*. The advanced options view has the following features:
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* *Find in view*: To search the required components in the view.
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* *Display options*: To configure the following options:
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** *Edge labels*: To show the specified measurements as edge labels. The default is to show the *Average rate* in *Bytes*.
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** *Edge labels*: To show the specified measurements as edge labels. The default is to show the *Average rate* in *Bytes*.
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** *Scope*: To select the scope of components between which the network traffic flows. The default value is *Namespace*.
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** *Groups*: To enhance the understanding of ownership by grouping the components. The default value is *None*.
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modules/network-observability-configuring-options-trafficflow.adoc

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:_mod-docs-content-type: PROCEDURE
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[id="network-observability-configuring-options-trafficflow_{context}"]
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= Configuring advanced options for the Traffic flows view
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You can customize and export the view by using *Show advanced options*.
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You can set the row size by using the *Display options* drop-down menu. The default value is *Normal*.
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modules/network-observability-dns-overview.adoc

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:_mod-docs-content-type: CONCEPT
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[id="network-observability-dns-overview_{context}"]
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= DNS tracking
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You can configure graphical representation of Domain Name System (DNS) tracking of network flows in the *Overview* view. Using DNS tracking with extended Berkeley Packet Filter (eBPF) tracepoint hooks can serve various purposes:
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* Network Monitoring: Gain insights into DNS queries and responses, helping network administrators identify unusual patterns, potential bottlenecks, or performance issues.

modules/network-observability-dns-tracking.adoc

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:_mod-docs-content-type: PROCEDURE
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[id="network-observability-dns-tracking_{context}"]
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= Working with DNS tracking
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Using DNS tracking, you can monitor your network, conduct security analysis, and troubleshoot DNS issues. You can track DNS by editing the `FlowCollector` to the specifications in the following YAML example.
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[IMPORTANT]
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[NOTE]
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TCP handshake packets do not have DNS headers. TCP protocol flows without DNS headers are shown in the traffic flow data with *DNS Latency*, *ID*, and *Response code* values of "n/a". You can filter out flow data to view only flows that have DNS headers using the *Common* filter "DNSError" equal to "0".
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TCP handshake packets do not have DNS headers. TCP protocol flows without DNS headers are shown in the traffic flow data with *DNS Latency*, *ID*, and *Response code* values of "n/a". You can filter out flow data to view only flows that have DNS headers using the *Common* filter "DNSError" equal to "0".
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====

modules/network-observability-ebpf-rule-flow-filter.adoc

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:_mod-docs-content-type: CONCEPT
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[id="network-observability-ebpf-flow-rule-filter_{context}"]
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= eBPF flow rule filter
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You can use rule-based filtering to control the volume of packets cached in the eBPF flow table. For example, a filter can specify that only packets coming from port 100 should be captured. Then only the packets that match the filter are captured and the rest are dropped.
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You can apply multiple filter rules.

modules/network-observability-filtering-ebpf-rule.adoc

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:_mod-docs-content-type: PROCEDURE
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[id="network-observability-filtering-ebpf-rule_{context}"]
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= Filtering eBPF flow data using multiple rules
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You can configure the `FlowCollector` custom resource to filter eBPF flows using multiple rules to control the flow of packets cached in the eBPF flow table.
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[IMPORTANT]

modules/network-observability-flow-filter-parameters.adoc

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[id="network-observability-flowcollector-flowfilter-parameters_{context}"]
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= Flow filter configuration parameters
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The flow filter rules consist of required and optional parameters.
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.Required configuration parameters

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