Document deprecated process runtime metrics

[alexmojaki]

Discussion in https://pydantic.slack.com/archives/C0813FX362E/p1741867835353059

In open-telemetry/opentelemetry-python-contrib#3250, these:

        'process.runtime.memory': ['rss', 'vms'],
        'process.runtime.cpu.time': ['user', 'system'],
        'process.runtime.cpu.utilization': None,
        'process.runtime.thread_count': None,
        'process.runtime.context_switches': ['involuntary', 'voluntary'],

were deprecated in favour of:

        'process.memory.usage': None,
        'process.memory.virtual': None,
        'process.cpu.time': ['user', 'system'],
        'process.cpu.utilization': ['user', 'system'],
        'process.thread.count': None,
        'process.context_switches': ['involuntary', 'voluntary'],

The new metrics are already being emitted alongside the old ones when using logfire.instrument_system_metrics(base='full'), we just note this in the docs and update the tests.

The default logfire.instrument_system_metrics() hasn't changed and isn't yet.

Both should be updated next time we make a major release: #932

Also added a new metric process.cpu.core_utilization which is equivalent to process.runtime.cpu.utilization in value. process.cpu.utilization isn't equivalent because it's divided by the number of cores which makes it less useful IMO.

Update to dashboard template: https://github.com/pydantic/platform/pull/8435

[hyperlint-ai]

PR Change Summary

Documented the deprecation of certain process runtime metrics and introduced new metrics in the system metrics documentation.

• Deprecated old process runtime metrics in favor of new metrics.
• Updated documentation to reflect the new metrics being emitted alongside the old ones.
• Clarified that the default metrics will be updated in the next major release.

Modified Files

• docs/integrations/system-metrics.md

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