CoreDNS (2.0) monitoring & observability

Metric name	Metric key	Description	Unit
Enabled plugin	coredns_plugin_enabled	Constant value indicating enabled plugins on a per server and zone basis	Count
Panic count	coredns_panics_total.count	The number of panics	Count
Health check failures	coredns_health_request_failures_total.count	The number of times the health check failed	Count
Health request duration histogram	coredns_health_request_duration_seconds	Metrics will be accessible as keys: coredns_health_request_duration_seconds_bucket.count, coredns_health_request_duration_seconds_count, and coredns_health_request_duration_seconds_sum.count	Unspecified
Forward max concurrent rejects	coredns_forward_max_concurrent_rejects_total.count	The number of queries rejected because the concurrent queries were at maximum	Count
Failed healthchecks per upstream	coredns_proxy_healthcheck_failures_total.count	Count of failed health checks per upstream	Count
Connection cache hits per upstream	coredns_proxy_conn_cache_hits_total.count	Number of connection cache hits per upstream and protoco	Count
Connection cache misses per upstream	coredns_proxy_conn_cache_misses_total.count	Number of connection cache misses per upstream and protocol	Count
Proxy request duration histogram	coredns_proxy_request_duration_seconds	Metrics will be accessible as keys: coredns_proxy_request_duration_seconds_bucket.count, coredns_proxy_request_duration_seconds_count, and coredns_proxy_request_duration_seconds_sum.count	Unspecified
Response size histogram	coredns_dns_response_size_bytes	Metrics will be accessible as keys: coredns_dns_response_size_bytes_bucket.count, coredns_dns_response_size_bytes_count, and coredns_dns_response_size_bytes_sum.count	Unspecified
DNS responses	coredns_dns_responses_total.count	The number of DNS responses by status code	Count
Request size histogram	coredns_dns_request_size_bytes	Metrics will be accessible as keys: coredns_dns_request_size_bytes_bucket.count, coredns_dns_request_size_bytes_count, and coredns_dns_request_size_bytes_sum.count	Unspecified
Request duration histogram	coredns_dns_request_duration_seconds	Metrics will be accessible as keys: coredns_dns_request_duration_seconds_bucket.count, coredns_dns_request_duration_seconds_count, and coredns_dns_request_duration_seconds_sum.count	Unspecified
DNS query count	coredns_dns_requests_total.count	The number of DNS requests made per zone, protocol, and family	Count
Cache size	coredns_cache_entries	The number of elements in the cache	Count
Cache hits	coredns_cache_hits_total.count	The number of cache hits	Count
Cache misses	coredns_cache_misses_total.count	The number of cache misses	Count
CoreDNS build info	coredns_build_info	A metric with a constant '1' value labeled by version, revision, and goversion from which CoreDNS was built	Count

Metric name	Metric key	Description	Unit
Stack memory obtained from OS	go_memstats_stack_sys_bytes	Number of bytes obtained from system for stack allocator	Byte
Go threads	go_threads	Number of OS threads created	Count
Memory obtained from OS	go_memstats_sys_bytes	Number of bytes obtained from system	Byte
Stack span in-use size	go_memstats_stack_inuse_bytes	Number of bytes in use by the stack allocator	Byte
Misc off-heap memory allocations	go_memstats_other_sys_bytes	Number of bytes used for other system allocations	Byte
Target heap size of next GC cycle	go_memstats_next_gc_bytes	Number of heap bytes when next garbage collection will take place	Byte
Memory obtained for mspan structres	go_memstats_mspan_sys_bytes	Number of bytes used for mspan structures obtained from system	Byte
Allocated mspan structure size	go_memstats_mspan_inuse_bytes	Number of bytes in use by mspan structures	Byte
Memory obtained for mcache structres	go_memstats_mcache_sys_bytes	Number of bytes used for mcache structures obtained from system	Byte
Mcache allocated structure size	go_memstats_mcache_inuse_bytes	Number of bytes in use by mcache structures	Byte
Allocations for heap objects	go_memstats_mallocs_total.count	Total number of mallocs	Count
Pointer lookups	go_memstats_lookups_total.count	Total number of pointer lookups	Count
Heap memory obtained from OS	go_memstats_heap_sys_bytes	Number of heap bytes obtained from system	Byte
Physical memory returned to OS	go_memstats_heap_released_bytes	Number of heap bytes released to OS	Byte
Allocated heap objects	go_memstats_heap_objects	Number of allocated objects	Count
In-use span size	go_memstats_heap_inuse_bytes	Number of heap bytes that are in use	Byte
Idle (unused) span size	go_memstats_heap_idle_bytes	Number of heap bytes waiting to be used	Byte
Allocated bytes	go_memstats_heap_alloc_bytes	Number of heap bytes allocated and still in use	Byte
Cumulative count of heap objects freed	go_memstats_frees_total.count	Total number of frees	Count
Profiling bucket hash table size	go_memstats_buck_hash_sys_bytes	Number of bytes used by the profiling bucket hash table	Byte
Number of goroutines	go_goroutines	Number of goroutines that currently exist	Count
GC duration	go_gc_duration_seconds	A summary of the pause duration of garbage collection cycles	Second
Size of memory in garbage collection metadata	go_memstats_gc_sys_bytes	Number of bytes used for garbage collection system metadata	Byte