api/routers/metrics.py

# Prometheus is for real-time system health. 
# Grafana visualize the output of Prometheus
# This is considered as Monitoring
from prometheus_client import Counter, Histogram, Gauge, make_asgi_app

metrics_asgi_app = make_asgi_app()


active_cameras = Gauge(
    "active_camera_connections",
    "Number of Currently Connected camera websockets"
)

active_dashboards = Gauge(
    "active_dashboards",
    "Number of active dashboards which fetching data"
)

frame_processing_duration_seconds = Histogram(
    "frame_processing_duration_seconds",
    "Time to process one frame",
    ["camera_id"]
)

decode_duration_seconds = Histogram(
    "decode_duration_seconds",
    "Time to decode one image",
    ["camera_id"]
)
detection_duration_seconds = Histogram(
    "detection_duration_seconds",
    "Time to detect",
    ["camera_id"]
)
depth_duration_seconds = Histogram(
    "depth_duration_seconds",
    "Time to calculate the depth",
    ["camera_id"]
)


cpu_usage = Gauge("cpu_usage_percent", "CPU usage %")
mem_usage = Gauge("mem_usage_percent", "mem usage %")

active_workers = Gauge("active_workers", "Active threads")