feat(quickstart): rich ClickHouse / host / otelcol observability via OTel collector#701

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feat/quickstart-rich-observability

Commits on May 22, 2026

feat(quickstart): rich ClickHouse / host / otelcol observability fanned in via OTel collector
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ci: trigger fresh compose-smoke (prior run cancelled mid-flight)
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ci: empty trigger #701 (prior runs cancelled by event chain)
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test(e2e): allowlist system_/clickhouse_event empties + MergeTree-IO panel
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test(e2e): consolidate clickhouse_event panel matches to single namespace prefix
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chore(dashboards): rename observability dashboards to bare subject names
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chore(dashboards): rename cerberus-self.json to cerberus.json and drop subtitle
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feat(quickstart): otel-collector 0.120.0->0.152.1 + bind-mount host /proc /sys for hostmetrics
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Commits on May 23, 2026

test(regression): drop transform/servicegraph_drop_exemplars pin + rename to service_graph
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