Add Prometheus metrics for HTTPX requests#130
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Add a new prometheus metrics module and hook it into HTTPX event handlers. Created src/om1_utils/prometheus/__init__.py which defines Histograms and Gauges for request duration, upstream total, upstream TTFB, and proxy total (including `_last_seconds` gauges). Updated src/om1_utils/httpx/__init__.py to import these metrics, handle missing request start_time (log a warning and skip metrics), compute elapsed time, and record observe/set metrics by parsing relevant response headers (convert ms to seconds and ignore invalid values).
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Add a new prometheus metrics module and hook it into HTTPX event handlers. Created src/om1_utils/prometheus/init.py which defines Histograms and Gauges for request duration, upstream total, upstream TTFB, and proxy total (including
_last_secondsgauges). Updated src/om1_utils/httpx/init.py to import these metrics, handle missing request start_time (log a warning and skip metrics), compute elapsed time, and record observe/set metrics by parsing relevant response headers (convert ms to seconds and ignore invalid values).