add metrics

.gitignore

@@ -1,3 +1,5 @@
 .idea/*
 bin/*
-vendor/
+vendor/
+apache_exporter
+

test/not_found.metrics

@@ -0,0 +1,128 @@
+# HELP apache_exporter_build_info A metric with a constant '1' value labeled by version, revision, branch, and goversion from which apache_exporter was built.
+# TYPE apache_exporter_build_info gauge
+apache_exporter_build_info{branch="",goversion="go1.16.4",revision="",version=""} 1
+# HELP apache_exporter_scrape_failures_total Number of errors while scraping apache.
+# TYPE apache_exporter_scrape_failures_total counter
+apache_exporter_scrape_failures_total 1
+# HELP apache_up Could the apache server be reached
+# TYPE apache_up gauge
+apache_up 0
+# 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"} 0
+go_gc_duration_seconds{quantile="0.25"} 0
+go_gc_duration_seconds{quantile="0.5"} 0
+go_gc_duration_seconds{quantile="0.75"} 0
+go_gc_duration_seconds{quantile="1"} 0
+go_gc_duration_seconds_sum 0
+go_gc_duration_seconds_count 0
+# HELP go_goroutines Number of goroutines that currently exist.
+# TYPE go_goroutines gauge
+go_goroutines 9
+# HELP go_info Information about the Go environment.
+# TYPE go_info gauge
+go_info{version="go1.16.4"} 1
+# HELP go_memstats_alloc_bytes Number of bytes allocated and still in use.
+# TYPE go_memstats_alloc_bytes gauge
+go_memstats_alloc_bytes 744464
+# HELP go_memstats_alloc_bytes_total Total number of bytes allocated, even if freed.
+# TYPE go_memstats_alloc_bytes_total counter
+go_memstats_alloc_bytes_total 744464
+# HELP go_memstats_buck_hash_sys_bytes Number of bytes used by the profiling bucket hash table.
+# TYPE go_memstats_buck_hash_sys_bytes gauge
+go_memstats_buck_hash_sys_bytes 4157
+# HELP go_memstats_frees_total Total number of frees.
+# TYPE go_memstats_frees_total counter
+go_memstats_frees_total 176
+# HELP go_memstats_gc_cpu_fraction The fraction of this program's available CPU time used by the GC since the program started.
+# TYPE go_memstats_gc_cpu_fraction gauge
+go_memstats_gc_cpu_fraction 0
+# HELP go_memstats_gc_sys_bytes Number of bytes used for garbage collection system metadata.
+# TYPE go_memstats_gc_sys_bytes gauge
+go_memstats_gc_sys_bytes 4.017656e+06
+# HELP go_memstats_heap_alloc_bytes Number of heap bytes allocated and still in use.
+# TYPE go_memstats_heap_alloc_bytes gauge
+go_memstats_heap_alloc_bytes 744464
+# HELP go_memstats_heap_idle_bytes Number of heap bytes waiting to be used.
+# TYPE go_memstats_heap_idle_bytes gauge
+go_memstats_heap_idle_bytes 6.4987136e+07
+# HELP go_memstats_heap_inuse_bytes Number of heap bytes that are in use.
+# TYPE go_memstats_heap_inuse_bytes gauge
+go_memstats_heap_inuse_bytes 1.662976e+06
+# HELP go_memstats_heap_objects Number of allocated objects.
+# TYPE go_memstats_heap_objects gauge
+go_memstats_heap_objects 2933
+# HELP go_memstats_heap_released_bytes Number of heap bytes released to OS.
+# TYPE go_memstats_heap_released_bytes gauge
+go_memstats_heap_released_bytes 6.4954368e+07
+# HELP go_memstats_heap_sys_bytes Number of heap bytes obtained from system.
+# TYPE go_memstats_heap_sys_bytes gauge
+go_memstats_heap_sys_bytes 6.6650112e+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 0
+# HELP go_memstats_lookups_total Total number of pointer lookups.
+# TYPE go_memstats_lookups_total counter
+go_memstats_lookups_total 0
+# HELP go_memstats_mallocs_total Total number of mallocs.
+# TYPE go_memstats_mallocs_total counter
+go_memstats_mallocs_total 3109
+# HELP go_memstats_mcache_inuse_bytes Number of bytes in use by mcache structures.
+# TYPE go_memstats_mcache_inuse_bytes gauge
+go_memstats_mcache_inuse_bytes 14400
+# HELP go_memstats_mcache_sys_bytes Number of bytes used for mcache structures obtained from system.
+# TYPE go_memstats_mcache_sys_bytes gauge
+go_memstats_mcache_sys_bytes 16384
+# HELP go_memstats_mspan_inuse_bytes Number of bytes in use by mspan structures.
+# TYPE go_memstats_mspan_inuse_bytes gauge
+go_memstats_mspan_inuse_bytes 46648
+# HELP go_memstats_mspan_sys_bytes Number of bytes used for mspan structures obtained from system.
+# TYPE go_memstats_mspan_sys_bytes gauge
+go_memstats_mspan_sys_bytes 49152
+# HELP go_memstats_next_gc_bytes Number of heap bytes when next garbage collection will take place.
+# TYPE go_memstats_next_gc_bytes gauge
+go_memstats_next_gc_bytes 4.473924e+06
+# HELP go_memstats_other_sys_bytes Number of bytes used for other system allocations.
+# TYPE go_memstats_other_sys_bytes gauge
+go_memstats_other_sys_bytes 978395
+# HELP go_memstats_stack_inuse_bytes Number of bytes in use by the stack allocator.
+# TYPE go_memstats_stack_inuse_bytes gauge
+go_memstats_stack_inuse_bytes 458752
+# HELP go_memstats_stack_sys_bytes Number of bytes obtained from system for stack allocator.
+# TYPE go_memstats_stack_sys_bytes gauge
+go_memstats_stack_sys_bytes 458752
+# HELP go_memstats_sys_bytes Number of bytes obtained from system.
+# TYPE go_memstats_sys_bytes gauge
+go_memstats_sys_bytes 7.2174608e+07
+# HELP go_threads Number of OS threads created.
+# TYPE go_threads gauge
+go_threads 9
+# 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
+# HELP process_max_fds Maximum number of open file descriptors.
+# TYPE process_max_fds gauge
+process_max_fds 1024
+# HELP process_open_fds Number of open file descriptors.
+# TYPE process_open_fds gauge
+process_open_fds 9
+# HELP process_resident_memory_bytes Resident memory size in bytes.
+# TYPE process_resident_memory_bytes gauge
+process_resident_memory_bytes 9.986048e+06
+# 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 1.62290564579e+09
+# HELP process_virtual_memory_bytes Virtual memory size in bytes.
+# TYPE process_virtual_memory_bytes gauge
+process_virtual_memory_bytes 1.184079872e+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
+# 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"} 0
+promhttp_metric_handler_requests_total{code="500"} 0
+promhttp_metric_handler_requests_total{code="503"} 0