Add defensive registration to metrics pkg #155
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Summary
Replaced the panic-prone global registration in the metrics package with a defensive register-or-reuse pattern and log unexpected registration errors instead of panicking.
The defensive approach preserves the normal runtime behaviour (single registration) while making tests and multi-import scenarios resilient to duplicate registration. Logging unexpected registration errors follows the project policy of avoiding panics in
init.Added tests exercising
PushMetricsand the counter logic.