Add Micrometer Observation instrumentation for GSP view rendering#15718

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codeconsole:feat/gsp-rendering-observability

Commits on Jun 5, 2026

Add Micrometer Observation instrumentation for GSP view rendering
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Generalize GSP observation kit; instrument template rendering (gsp.template)
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Instrument GSP layout decoration (gsp.layout)
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Relocate GSP observation kit to grails-gsp-core; instrument compilation (gsp.compile)
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Add GSP template-cache hit/miss metrics (gsp.template.cache)
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Test gsp.compile observation and gsp.template.cache hit/miss
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Commits on Jun 7, 2026

GSP observability: track production caches, not the dev compile cache; gsp.name high-cardinality
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