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<h1 id="chaos-workloads"><a class="header" href="#chaos-workloads">Chaos Workloads</a></h1>
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<blockquote>
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<p><strong>When should I read this?</strong> You don't need chaos testing to be productive with the framework. Focus on basic scenarios first—chaos is for resilience validation and operational readiness drills once your core tests are stable.</p>
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</blockquote>
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<p>Chaos in the framework uses node control to introduce failures and validate
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recovery. The built-in restart workload lives in
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<code>testing_framework_workflows::workloads::chaos::RandomRestartWorkload</code>.</p>
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<h2 id="how-it-works"><a class="header" href="#how-it-works">How it works</a></h2>
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<ul>
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<li>Requires <code>NodeControlCapability</code> (<code>enable_node_control()</code> in the scenario
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builder) and a runner that provides a <code>NodeControlHandle</code>.</li>
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<li>Randomly selects nodes (validators, executors) to restart based on your
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include/exclude flags.</li>
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<li>Respects min/max delay between restarts and a target cooldown to avoid
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flapping the same node too frequently.</li>
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<li>Runs alongside other workloads; expectations should account for the added
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disruption.</li>
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<li>Support varies by runner: node control is not provided by the local runner
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and is not yet implemented for the k8s runner. Use a runner that advertises
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<code>NodeControlHandle</code> support (e.g., compose) for chaos workloads.</li>
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</ul>
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<h2 id="usage"><a class="header" href="#usage">Usage</a></h2>
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<pre><code class="language-rust ignore">use std::time::Duration;
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use testing_framework_core::scenario::ScenarioBuilder;
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use testing_framework_workflows::{ScenarioBuilderExt, workloads::chaos::RandomRestartWorkload};
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pub fn random_restart_plan() -> testing_framework_core::scenario::Scenario<
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testing_framework_core::scenario::NodeControlCapability,
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> {
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ScenarioBuilder::topology_with(|t| t.network_star().validators(2).executors(1))
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.enable_node_control()
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.with_workload(RandomRestartWorkload::new(
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Duration::from_secs(45), // min delay
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Duration::from_secs(75), // max delay
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Duration::from_secs(120), // target cooldown
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true, // include validators
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true, // include executors
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))
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.expect_consensus_liveness()
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.with_run_duration(Duration::from_secs(150))
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.build()
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}</code></pre>
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<h2 id="expectations-to-pair"><a class="header" href="#expectations-to-pair">Expectations to pair</a></h2>
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<ul>
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<li><strong>Consensus liveness</strong>: ensure blocks keep progressing despite restarts.</li>
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<li><strong>Height convergence</strong>: optionally check all nodes converge after the chaos
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window.</li>
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<li>Any workload-specific inclusion checks if you’re also driving tx/DA traffic.</li>
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</ul>
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<h2 id="best-practices"><a class="header" href="#best-practices">Best practices</a></h2>
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<ul>
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<li>Keep delays/cooldowns realistic; avoid back-to-back restarts that would never
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happen in production.</li>
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<li>Limit chaos scope: toggle validators vs executors based on what you want to
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test.</li>
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<li>Combine with observability: monitor metrics/logs to explain failures.</li>
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</ul>
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