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A few statistics are emitted to report statistics system behavior:
| Name | Type | Description |
|---|---|---|
| stats.overflow | Counter | Total number of times Envoy cannot allocate a statistic due to a shortage of shared memory |
Server
Server related statistics are rooted at server. with following statistics:
| Name | Type | Description |
|---|---|---|
| uptime | Gauge | Current server uptime in seconds |
| concurrency | Gauge | Number of worker threads |
| memory_allocated | Gauge | Current amount of allocated memory in bytes. Total of both new and old Envoy processes on hot restart. |
| memory_heap_size | Gauge | Current reserved heap size in bytes. New Envoy process heap size on hot restart. |
| live | Gauge | 1 if the server is not currently draining, 0 otherwise |
| parent_connections | Gauge | Total connections of the old Envoy process on hot restart |
| total_connections | Gauge | Total connections of both new and old Envoy processes |
| version | Gauge | Integer represented version number based on SCM revision |
| days_until_first_cert_expiring | Gauge | Number of days until the next certificate being managed will expire |
| hot_restart_epoch | Gauge | Current hot restart epoch |
| debug_assertion_failures | Counter | Number of debug assertion failures detected in a release build if compiled with –define log_debug_assert_in_release=enabled or zero otherwise |
File system
Statistics related to file system are emitted in the filesystem. namespace.
| Name | Type | Description |
|---|---|---|
| write_buffered | Counter | Total number of times file data is moved to Envoy’s internal flush buffer |
| write_completed | Counter | Total number of times a file was written |
| flushed_by_timer | Counter | Total number of times internal flush buffers are written to a file due to flush timeout |
| reopen_failed | Counter | Total number of times a file was failed to be opened |
| write_total_buffered | Gauge | Current total size of internal flush buffer in bytes |
