CoreDNS is a DNS server written in Go language. It can be used in a multitude of environments because of its flexibility. CoreDNS is licensed under the Apache License Version 2, and completely open source.
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Go to Resources under the Infrastructure tab to check if your resources are onboarded and the metrics are collected.
Supported metrics
| OpsRamp Metric | Metric Display Name | Unit |
|---|---|---|
| kube_coredns_response_code_count Rate of response status codes | CoreDNS Response Code Rate | |
| kube_coredns_cache_hits Rate of cache hits | Cache Hits Rate | |
| kube_coredns_cache_misses Rate of cache misses | Cache Misses Rate | |
| kube_coredns_cache_size Number of elements in the cache | Cache Size | |
| kube_coredns_dns_request_count Rate of DNS requests made per zone, protocol and family | DNS Requests Rate Per Protocol | |
| kube_coredns_dns_request_type_count Rate of DNS requests per type, per zone | DNS Requests Rate Per Type | |
| kube_coredns_dns_request_duration_seconds Average time taken by each request | Average Request Time | seconds |
| kube_coredns_forward_request_duration_seconds Average time taken by each forward request | Average Forward Request Time | seconds |
| kube_coredns_forward_request_count Rate of requests made per upstream | Upstream Request Rate | |
| kube_coredns_forward_response_rcode_count Rate of RCODEs per upstream | RCODEs Upstream Rate | |
| kube_coredns_forward_healthcheck_failure_count Number of failed health checks per upstream | Failed Health Checks Number | |
| kube_coredns_forward_healthcheck_broken_count Count of when all upstreams are unhealthy | Health Checks Broken Counter | |
| kube_coredns_forward_max_concurrent_reject_count Count of the number of queries rejected because the number of concurrent queries were at maximum | Max Conccurrent Rejects Rate | |
| kube_coredns_health_request_duration_seconds Average duration to process a HTTP query to the local /health endpoint | Average Health Endpoint Duration | seconds |
| kube_coredns_dns_request_size Average size of the request | Average Request Size | bytes |
| kube_coredns_dns_response_size Average size of the response | Average Response Size | bytes |
| kube_coredns_panic_count Rate of panics | Panic Rate | |
| kube_coredns_go_gc_duration_seconds Average of the GC invocation durations | Average GC Invocation Durations | seconds |
| kube_coredns_go_gc_duration_seconds_quantile GC invocation durations Quantiles | GC Invocation Durations Quantiles | Quantile |
| kube_coredns_go_goroutines Number of goroutines that currently exist | GORoutines Count | |
| kube_coredns_go_memstats_alloc_bytes Number of bytes allocated and still in use | GO Bytes Allocated And In Use | bytes |
| kube_coredns_go_memstats_alloc_bytes_total Total number of bytes allocated, even if free | Total GO Bytes Allocated | bytes |
| kube_coredns_go_memstats_buck_hash_sys_bytes Number of bytes used by the profiling bucket hash table | Bytes Used By Profiling Bucket Hash Table | bytes |
| kube_coredns_go_memstats_frees_total Total number of frees | Total GO Frees | |
| kube_coredns_go_memstats_gc_cpu_fraction Fraction of this program available CPU time used by the GC since the program started | GO CPU Time Used By GC | |
| kube_coredns_go_memstats_gc_sys_bytes Number of bytes used for garbage collection system metadata | GO Bytes Used By GC | bytes |
| kube_coredns_go_memstats_heap_alloc_bytes Number of heap bytes allocated and still in use | GO Heap Bytes Allocated | bytes |
| kube_coredns_go_memstats_heap_idle_bytes Number of heap bytes waiting to be used | GO Heap Idle Bytes | bytes |
| kube_coredns_go_memstats_heap_inuse_bytes Number of heap bytes that are in use | GO Heap Bytes In Use | bytes |
| kube_coredns_go_memstats_heap_objects Number of allocated objects | GO Allocated Heap Objects | |
| kube_coredns_go_memstats_heap_released_bytes Number of heap bytes released to Operating System | GO Heap Bytes Released | |
| kube_coredns_go_memstats_heap_sys_bytes Number of heap bytes geted from system | GO Heap Bytes Geted | |
| kube_coredns_go_memstats_last_gc_time_seconds Number of seconds since 1970 of last garbage collection | GO GC Seconds Since UNIX Epoch | seconds |
| kube_coredns_go_memstats_lookups_total Rate of number of pointer lookups | GO Pointer Lookups Rate | |
| kube_coredns_go_memstats_mallocs_total Rate of mallocs | GO Malloc Rate | |
| kube_coredns_go_memstats_mcache_inuse_bytes Number of bytes in use by mcache structures | GO Bytes Used MCache | bytes |
| kube_coredns_go_memstats_mcache_sys_bytes Number of bytes used for mcache structures geted from system | GO MCache System Bytes | bytes |
| kube_coredns_go_memstats_mspan_inuse_bytes Number of bytes in use by mspan structures | GO Bytes Used MSpan | bytes |
| kube_coredns_go_memstats_mspan_sys_bytes Number of bytes used for mspan structures geted from system | GO MSpan System Bytes | bytes |
| kube_coredns_go_memstats_next_gc_bytes Number of heap bytes when next garbage collection will take place | GO Next GC Bytes | bytes |
| kube_coredns_go_memstats_other_sys_bytes Number of bytes used for other system allocations | GO Other System Allocations | bytes |
| kube_coredns_go_memstats_stack_inuse_bytes Number of bytes in use by the stack allocator | GO Bytes Used Stack Allocator | bytes |
| kube_coredns_go_memstats_stack_sys_bytes Number of bytes geted from system for stack allocator | GO Stack Allocator System Bytes | bytes |
| kube_coredns_go_memstats_sys_bytes Number of bytes geted from system | GO System Bytes | bytes |
| kube_coredns_go_threads Number of OS threads created | GO Threads | |
| kube_coredns_plugin_enabled Indicates whether a plugin is enabled on per server and zone basis | CoreDNS Plugins Enabled | |
| kube_coredns_process_cpu_seconds_total Rate of user and system CPU time spent | Process CPU Rate | seconds |
| kube_coredns_process_max_fds Maximum number of open file descriptors | Process Max Open File Descriptors | |
| kube_coredns_process_open_fds Number of open file descriptors | Process Open File Descriptors | |
| kube_coredns_process_resident_memory_bytes Size of Resident memory | Process Resident Memory | bytes |
| kube_coredns_process_virtual_memory_bytes Size of virtual memory | Process Virtual Memory | bytes |