feature: redo routesrv metrics

[szuecs]

closed #2631 in order to have the open PR with base cw2023freeze instead of master

run routesrv example in case you have kubectl proxy running:

% bin/routesrv -kubernetes -enable-swarm -kubernetes-redis-service-name skipper-ingress-redis -kubernetes-redis-service-namespace kube-system -enable-profile

% curl http://127.0.0.1:9911/metrics
# HELP go_gc_duration_seconds A summary of the pause duration of garbage collection cycles.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 3.8953e-05
go_gc_duration_seconds{quantile="0.25"} 7.7036e-05
go_gc_duration_seconds{quantile="0.5"} 7.9229e-05
go_gc_duration_seconds{quantile="0.75"} 8.8677e-05
go_gc_duration_seconds{quantile="1"} 0.000158278
go_gc_duration_seconds_sum 0.000829073
go_gc_duration_seconds_count 10
...
# HELP go_memstats_sys_bytes Number of bytes obtained from system.
# TYPE go_memstats_sys_bytes gauge
go_memstats_sys_bytes 2.5531656e+07
# HELP go_threads Number of OS threads created.
# TYPE go_threads gauge
go_threads 21
# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 0.32
# HELP process_max_fds Maximum number of open file descriptors.
# TYPE process_max_fds gauge
process_max_fds 60000
# HELP process_open_fds Number of open file descriptors.
# TYPE process_open_fds gauge
process_open_fds 10
# HELP process_resident_memory_bytes Resident memory size in bytes.
# TYPE process_resident_memory_bytes gauge
process_resident_memory_bytes 4.3958272e+07
# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
# TYPE process_start_time_seconds gauge
process_start_time_seconds 1.69876608374e+09
# HELP process_virtual_memory_bytes Virtual memory size in bytes.
# TYPE process_virtual_memory_bytes gauge
process_virtual_memory_bytes 2.747961344e+09
# HELP process_virtual_memory_max_bytes Maximum amount of virtual memory available in bytes.
# TYPE process_virtual_memory_max_bytes gauge
process_virtual_memory_max_bytes 1.8446744073709552e+19
# HELP routesrv_backend_combined_duration_seconds Duration in seconds of a proxy backend combined.
# TYPE routesrv_backend_combined_duration_seconds histogram
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="0.005"} 5
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="0.01"} 5
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="0.025"} 5
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="0.05"} 5
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="0.1"} 5
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="0.25"} 5
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="0.5"} 5
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="1"} 5
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="2.5"} 5
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="5"} 5
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="10"} 5
routesrv_backend_combined_duration_seconds_bucket{version="v0.18.38-8-g7922c154",le="+Inf"} 5
routesrv_backend_combined_duration_seconds_sum{version="v0.18.38-8-g7922c154"} 0.001349441
routesrv_backend_combined_duration_seconds_count{version="v0.18.38-8-g7922c154"} 5
# HELP routesrv_backend_duration_seconds Duration in seconds of a proxy backend.
# TYPE routesrv_backend_duration_seconds histogram
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="0.005"} 5
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="0.01"} 5
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="0.025"} 5
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="0.05"} 5
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="0.1"} 5
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="0.25"} 5
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="0.5"} 5
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="1"} 5
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="2.5"} 5
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="5"} 5
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="10"} 5
routesrv_backend_duration_seconds_bucket{host="",route="routersv",version="v0.18.38-8-g7922c154",le="+Inf"} 5
routesrv_backend_duration_seconds_sum{host="",route="routersv",version="v0.18.38-8-g7922c154"} 0.001349441
routesrv_backend_duration_seconds_count{host="",route="routersv",version="v0.18.38-8-g7922c154"} 5
# HELP routesrv_custom_gauges Gauges number of custom metrics.
# TYPE routesrv_custom_gauges gauge
routesrv_custom_gauges{key="polling_started_timestamp",version="v0.18.38-8-g7922c154"} 1.69876646881321e+09
routesrv_custom_gauges{key="redis_endpoints",version="v0.18.38-8-g7922c154"} 1
routesrv_custom_gauges{key="routes.byte",version="v0.18.38-8-g7922c154"} 91378
routesrv_custom_gauges{key="routes.initialized_timestamp",version="v0.18.38-8-g7922c154"} 1.6987664689696188e+09
routesrv_custom_gauges{key="routes.total",version="v0.18.38-8-g7922c154"} 258
routesrv_custom_gauges{key="routes.updated_timestamp",version="v0.18.38-8-g7922c154"} 1.698766468969631e+09
# HELP routesrv_custom_total Total number of custom metrics.
# TYPE routesrv_custom_total counter
routesrv_custom_total{key="200",version="v0.18.38-8-g7922c154"} 5

profiling:

% curl http://127.0.0.1:9911/debug/pprof/
<html>
<head>
<title>/debug/pprof/</title>
<style>
.profile-name{
        display:inline-block;
        width:6rem;
}
</style>
</head>
<body>
/debug/pprof/
...

[MustafaSaber]

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[szuecs]

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[MustafaSaber]

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