Add metric labels

[mostafa]

Ticket(s)

Closes #611.

Description

This PR adds labels to metrics to be populated with the config group and config block names.

Exposed Prometheus Metrics

# HELP gatewayd_bytes_received_from_client Number of bytes received from client
# TYPE gatewayd_bytes_received_from_client summary
gatewayd_bytes_received_from_client_sum{block="reads",group="default"} 1204
gatewayd_bytes_received_from_client_count{block="reads",group="default"} 11
gatewayd_bytes_received_from_client_sum{block="writes",group="default"} 5944
gatewayd_bytes_received_from_client_count{block="writes",group="default"} 46
# HELP gatewayd_bytes_received_from_server Number of bytes received from server
# TYPE gatewayd_bytes_received_from_server summary
gatewayd_bytes_received_from_server_sum{block="reads",group="default"} 1578
gatewayd_bytes_received_from_server_count{block="reads",group="default"} 8
gatewayd_bytes_received_from_server_sum{block="writes",group="default"} 12913
gatewayd_bytes_received_from_server_count{block="writes",group="default"} 33
# HELP gatewayd_bytes_sent_to_client Number of bytes sent to client
# TYPE gatewayd_bytes_sent_to_client summary
gatewayd_bytes_sent_to_client_sum{block="reads",group="default"} 1578
gatewayd_bytes_sent_to_client_count{block="reads",group="default"} 7
gatewayd_bytes_sent_to_client_sum{block="writes",group="default"} 12913
gatewayd_bytes_sent_to_client_count{block="writes",group="default"} 27
# HELP gatewayd_bytes_sent_to_server Number of bytes sent to server
# TYPE gatewayd_bytes_sent_to_server summary
gatewayd_bytes_sent_to_server_sum{block="reads",group="default"} 1188
gatewayd_bytes_sent_to_server_count{block="reads",group="default"} 8
gatewayd_bytes_sent_to_server_sum{block="writes",group="default"} 5888
gatewayd_bytes_sent_to_server_count{block="writes",group="default"} 33
# HELP gatewayd_client_connections Number of client connections
# TYPE gatewayd_client_connections gauge
gatewayd_client_connections{block="reads",group="default"} 1
gatewayd_client_connections{block="writes",group="default"} 1
# HELP gatewayd_plugin_hooks_executed_total Number of plugin hooks executed
# TYPE gatewayd_plugin_hooks_executed_total counter
gatewayd_plugin_hooks_executed_total 237
# HELP gatewayd_plugin_hooks_registered_total Number of plugin hooks registered
# TYPE gatewayd_plugin_hooks_registered_total counter
gatewayd_plugin_hooks_registered_total 0
# HELP gatewayd_plugins_loaded_total Number of plugins loaded
# TYPE gatewayd_plugins_loaded_total counter
gatewayd_plugins_loaded_total 0
# HELP gatewayd_proxied_connections Number of proxy connects
# TYPE gatewayd_proxied_connections gauge
gatewayd_proxied_connections{block="reads",group="default"} 1
gatewayd_proxied_connections{block="writes",group="default"} 1
# HELP gatewayd_proxy_health_checks_total Number of proxy health checks
# TYPE gatewayd_proxy_health_checks_total counter
gatewayd_proxy_health_checks_total{block="reads",group="default"} 2
gatewayd_proxy_health_checks_total{block="writes",group="default"} 2
# HELP gatewayd_proxy_passthroughs_to_client_total Number of successful proxy passthroughs from server to client
# TYPE gatewayd_proxy_passthroughs_to_client_total counter
gatewayd_proxy_passthroughs_to_client_total{block="reads",group="default"} 7
gatewayd_proxy_passthroughs_to_client_total{block="writes",group="default"} 27
# HELP gatewayd_proxy_passthroughs_to_server_total Number of successful proxy passthroughs from client to server
# TYPE gatewayd_proxy_passthroughs_to_server_total counter
gatewayd_proxy_passthroughs_to_server_total{block="reads",group="default"} 8
gatewayd_proxy_passthroughs_to_server_total{block="writes",group="default"} 33
# HELP gatewayd_server_connections Number of server connections
# TYPE gatewayd_server_connections gauge
gatewayd_server_connections{block="",group=""} -36
gatewayd_server_connections{block="reads",group="default"} 30
gatewayd_server_connections{block="writes",group="default"} 26
# HELP gatewayd_server_ticks_fired_total Total number of server ticks fired
# TYPE gatewayd_server_ticks_fired_total counter
gatewayd_server_ticks_fired_total 0
# HELP gatewayd_traffic_bytes Number of total bytes passed through GatewayD via client or server
# TYPE gatewayd_traffic_bytes summary
gatewayd_traffic_bytes_sum{block="reads",group="default"} 5548
gatewayd_traffic_bytes_count{block="reads",group="default"} 34
gatewayd_traffic_bytes_sum{block="writes",group="default"} 37658
gatewayd_traffic_bytes_count{block="writes",group="default"} 139
# HELP go_gc_duration_seconds A summary of the wall-time pause (stop-the-world) duration in garbage collection cycles.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 2.6703e-05
go_gc_duration_seconds{quantile="0.25"} 8.5377e-05
go_gc_duration_seconds{quantile="0.5"} 0.000243246
go_gc_duration_seconds{quantile="0.75"} 0.000292101
go_gc_duration_seconds{quantile="1"} 0.000323811
go_gc_duration_seconds_sum 0.001992085
go_gc_duration_seconds_count 10
# HELP go_gc_gogc_percent Heap size target percentage configured by the user, otherwise 100. This value is set by the GOGC environment variable, and the runtime/debug.SetGCPercent function. Sourced from /gc/gogc:percent
# TYPE go_gc_gogc_percent gauge
go_gc_gogc_percent 100
# HELP go_gc_gomemlimit_bytes Go runtime memory limit configured by the user, otherwise math.MaxInt64. This value is set by the GOMEMLIMIT environment variable, and the runtime/debug.SetMemoryLimit function. Sourced from /gc/gomemlimit:bytes
# TYPE go_gc_gomemlimit_bytes gauge
go_gc_gomemlimit_bytes 9.223372036854776e+18
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 38
# HELP go_info Information about the Go environment.
# TYPE go_info gauge
go_info{version="go1.23.1"} 1
# HELP go_memstats_alloc_bytes Number of bytes allocated in heap and currently in use. Equals to /memory/classes/heap/objects:bytes.
# TYPE go_memstats_alloc_bytes gauge
go_memstats_alloc_bytes 8.106104e+06
# HELP go_memstats_alloc_bytes_total Total number of bytes allocated in heap until now, even if released already. Equals to /gc/heap/allocs:bytes.
# TYPE go_memstats_alloc_bytes_total counter
go_memstats_alloc_bytes_total 3.2990824e+07
# HELP go_memstats_buck_hash_sys_bytes Number of bytes used by the profiling bucket hash table. Equals to /memory/classes/profiling/buckets:bytes.
# TYPE go_memstats_buck_hash_sys_bytes gauge
go_memstats_buck_hash_sys_bytes 6321
# HELP go_memstats_frees_total Total number of heap objects frees. Equals to /gc/heap/frees:objects + /gc/heap/tiny/allocs:objects.
# TYPE go_memstats_frees_total counter
go_memstats_frees_total 206104
# HELP go_memstats_gc_sys_bytes Number of bytes used for garbage collection system metadata. Equals to /memory/classes/metadata/other:bytes.
# TYPE go_memstats_gc_sys_bytes gauge
go_memstats_gc_sys_bytes 3.446832e+06
# HELP go_memstats_heap_alloc_bytes Number of heap bytes allocated and currently in use, same as go_memstats_alloc_bytes. Equals to /memory/classes/heap/objects:bytes.
# TYPE go_memstats_heap_alloc_bytes gauge
go_memstats_heap_alloc_bytes 8.106104e+06
# HELP go_memstats_heap_idle_bytes Number of heap bytes waiting to be used. Equals to /memory/classes/heap/released:bytes + /memory/classes/heap/free:bytes.
# TYPE go_memstats_heap_idle_bytes gauge
go_memstats_heap_idle_bytes 8.429568e+06
# HELP go_memstats_heap_inuse_bytes Number of heap bytes that are in use. Equals to /memory/classes/heap/objects:bytes + /memory/classes/heap/unused:bytes
# TYPE go_memstats_heap_inuse_bytes gauge
go_memstats_heap_inuse_bytes 1.1444224e+07
# HELP go_memstats_heap_objects Number of currently allocated objects. Equals to /gc/heap/objects:objects.
# TYPE go_memstats_heap_objects gauge
go_memstats_heap_objects 15094
# HELP go_memstats_heap_released_bytes Number of heap bytes released to OS. Equals to /memory/classes/heap/released:bytes.
# TYPE go_memstats_heap_released_bytes gauge
go_memstats_heap_released_bytes 3.915776e+06
# HELP go_memstats_heap_sys_bytes Number of heap bytes obtained from system. Equals to /memory/classes/heap/objects:bytes + /memory/classes/heap/unused:bytes + /memory/classes/heap/released:bytes + /memory/classes/heap/free:bytes.
# TYPE go_memstats_heap_sys_bytes gauge
go_memstats_heap_sys_bytes 1.9873792e+07
# HELP go_memstats_last_gc_time_seconds Number of seconds since 1970 of last garbage collection.
# TYPE go_memstats_last_gc_time_seconds gauge
go_memstats_last_gc_time_seconds 1.7278142067925987e+09
# HELP go_memstats_mallocs_total Total number of heap objects allocated, both live and gc-ed. Semantically a counter version for go_memstats_heap_objects gauge. Equals to /gc/heap/allocs:objects + /gc/heap/tiny/allocs:objects.
# TYPE go_memstats_mallocs_total counter
go_memstats_mallocs_total 221198
# HELP go_memstats_mcache_inuse_bytes Number of bytes in use by mcache structures. Equals to /memory/classes/metadata/mcache/inuse:bytes.
# TYPE go_memstats_mcache_inuse_bytes gauge
go_memstats_mcache_inuse_bytes 19200
# HELP go_memstats_mcache_sys_bytes Number of bytes used for mcache structures obtained from system. Equals to /memory/classes/metadata/mcache/inuse:bytes + /memory/classes/metadata/mcache/free:bytes.
# TYPE go_memstats_mcache_sys_bytes gauge
go_memstats_mcache_sys_bytes 31200
# HELP go_memstats_mspan_inuse_bytes Number of bytes in use by mspan structures. Equals to /memory/classes/metadata/mspan/inuse:bytes.
# TYPE go_memstats_mspan_inuse_bytes gauge
go_memstats_mspan_inuse_bytes 183840
# HELP go_memstats_mspan_sys_bytes Number of bytes used for mspan structures obtained from system. Equals to /memory/classes/metadata/mspan/inuse:bytes + /memory/classes/metadata/mspan/free:bytes.
# TYPE go_memstats_mspan_sys_bytes gauge
go_memstats_mspan_sys_bytes 228480
# HELP go_memstats_next_gc_bytes Number of heap bytes when next garbage collection will take place. Equals to /gc/heap/goal:bytes.
# TYPE go_memstats_next_gc_bytes gauge
go_memstats_next_gc_bytes 1.4506984e+07
# HELP go_memstats_other_sys_bytes Number of bytes used for other system allocations. Equals to /memory/classes/other:bytes.
# TYPE go_memstats_other_sys_bytes gauge
go_memstats_other_sys_bytes 2.094287e+06
# HELP go_memstats_stack_inuse_bytes Number of bytes obtained from system for stack allocator in non-CGO environments. Equals to /memory/classes/heap/stacks:bytes.
# TYPE go_memstats_stack_inuse_bytes gauge
go_memstats_stack_inuse_bytes 1.015808e+06
# HELP go_memstats_stack_sys_bytes Number of bytes obtained from system for stack allocator. Equals to /memory/classes/heap/stacks:bytes + /memory/classes/os-stacks:bytes.
# TYPE go_memstats_stack_sys_bytes gauge
go_memstats_stack_sys_bytes 1.015808e+06
# HELP go_memstats_sys_bytes Number of bytes obtained from system. Equals to /memory/classes/total:byte.
# TYPE go_memstats_sys_bytes gauge
go_memstats_sys_bytes 2.669672e+07
# HELP go_sched_gomaxprocs_threads The current runtime.GOMAXPROCS setting, or the number of operating system threads that can execute user-level Go code simultaneously. Sourced from /sched/gomaxprocs:threads
# TYPE go_sched_gomaxprocs_threads gauge
go_sched_gomaxprocs_threads 16
# HELP go_threads Number of OS threads created.
# TYPE go_threads gauge
go_threads 16
# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 0.29
# HELP process_max_fds Maximum number of open file descriptors.
# TYPE process_max_fds gauge
process_max_fds 1.048576e+06
# HELP process_network_receive_bytes_total Number of bytes received by the process over the network.
# TYPE process_network_receive_bytes_total counter
process_network_receive_bytes_total 2.02998181e+08
# HELP process_network_transmit_bytes_total Number of bytes sent by the process over the network.
# TYPE process_network_transmit_bytes_total counter
process_network_transmit_bytes_total 2.05111159e+08
# HELP process_open_fds Number of open file descriptors.
# TYPE process_open_fds gauge
process_open_fds 34
# HELP process_resident_memory_bytes Resident memory size in bytes.
# TYPE process_resident_memory_bytes gauge
process_resident_memory_bytes 4.5420544e+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 1.72781407123e+09
# HELP process_virtual_memory_bytes Virtual memory size in bytes.
# TYPE process_virtual_memory_bytes gauge
process_virtual_memory_bytes 2.358419456e+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 promhttp_metric_handler_requests_in_flight Current number of scrapes being served.
# TYPE promhttp_metric_handler_requests_in_flight gauge
promhttp_metric_handler_requests_in_flight 1
# HELP promhttp_metric_handler_requests_total Total number of scrapes by HTTP status code.
# TYPE promhttp_metric_handler_requests_total counter
promhttp_metric_handler_requests_total{code="200"} 26
promhttp_metric_handler_requests_total{code="500"} 0
promhttp_metric_handler_requests_total{code="503"} 0

Related PRs

N/A

Development Checklist

• I have added a descriptive title to this PR.
• I have squashed related commits together.
• I have rebased my branch on top of the latest main branch.
• I have performed a self-review of my own code.
• I have commented on my code, particularly in hard-to-understand areas.
• I have added docstring(s) to my code.
• I have made corresponding changes to the documentation (docs).
• I have updated docs using make gen-docs command.
• I have added tests for my changes.
• I have signed all the commits.

Legal Checklist

• I have read the CONTRIBUTING document.
• I have read and understood the Code of Conduct.
• I have read and agreed to the Apache CLA (required).
• I have read and agreed to the LICENSE (required).

[github-actions]

Overview

Image reference	ghcr.io/gatewayd-io/gatewayd:44667ca	gatewaydio/gatewayd:latest
- digest	a98414f892d3	c0d87a848696
- tag	44667ca	latest
- provenance		9ec6b54
- vulnerabilities
- platform	linux/amd64	linux/amd64
- size	19 MB	17 MB (-2.3 MB)
- packages	136	132 (-4)
Base Image	alpine:3 also known as: • 3.20 • 3.20.3 • latest	alpine:3.20 also known as: • 3 • 3.20.3 • latest
- vulnerabilities

Packages and Vulnerabilities (5 package changes and 0 vulnerability changes)

• ➖ 3 packages removed
• ♾️ 2 packages changed
• 127 packages unchanged

Changes for packages of type apk (3 changes)

	Package	Version ghcr.io/gatewayd-io/gatewayd:44667ca	Version gatewaydio/gatewayd:latest
➖	ca-certificates	20240705-r0
➖	openssl	3.3.2-r0
➖	pax-utils	1.3.7-r2

Changes for packages of type golang (2 changes)

	Package	Version ghcr.io/gatewayd-io/gatewayd:44667ca	Version gatewaydio/gatewayd:latest
♾️	github.com/gatewayd-io/gatewayd	(devel)	0.9.8
♾️	stdlib	go1.23.1	1.23.1

[sinadarbouy]

LGTM! 🚀