[druid] branch master updated: improve the metric definition (#11602)

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maytasm pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/druid.git


The following commit(s) were added to refs/heads/master by this push:
     new 332e68e  improve the metric definition (#11602)
332e68e is described below

commit 332e68edb58a4b7ce6930365437229ec4254bd44
Author: imply-jhan <87...@users.noreply.github.com>
AuthorDate: Mon Aug 16 22:31:42 2021 -0700

    improve the metric definition (#11602)
---
 docs/operations/metrics.md                                              | 2 +-
 .../prometheus-emitter/src/main/resources/defaultMetrics.json           | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/operations/metrics.md b/docs/operations/metrics.md
index 0ed0ff4..cec0af0 100644
--- a/docs/operations/metrics.md
+++ b/docs/operations/metrics.md
@@ -180,7 +180,7 @@ These metrics are only available if the RealtimeMetricsMonitor is included in th
 |`ingest/merge/cpu`|Cpu time in Nanoseconds spent on merging intermediate segments.|dataSource, taskId, taskType.|Depends on configuration. Generally a few minutes at most.|
 |`ingest/handoff/count`|Number of handoffs that happened.|dataSource, taskId, taskType.|Varies. Generally greater than 0 once every segment granular period if cluster operating normally|
 |`ingest/sink/count`|Number of sinks not handoffed.|dataSource, taskId, taskType.|1~3|
-|`ingest/events/messageGap`|Time gap between the data time in event and current system time.|dataSource, taskId, taskType.|Greater than 0, depends on the time carried in event |
+|`ingest/events/messageGap`|Time gap in milliseconds between the latest ingested event timestamp and the current system timestamp of metrics emission. |dataSource, taskId, taskType.|Greater than 0, depends on the time carried in event |
 |`ingest/notices/queueSize`|Number of pending notices to be processed by the coordinator|dataSource.|Typically 0 and occasionally in lower single digits. Should not be a very high number. |
 |`ingest/notices/time`|Milliseconds taken to process a notice by the supervisor|dataSource, noticeType.| < 1s. |
 
diff --git a/extensions-contrib/prometheus-emitter/src/main/resources/defaultMetrics.json b/extensions-contrib/prometheus-emitter/src/main/resources/defaultMetrics.json
index c89d41e..b2d1438 100644
--- a/extensions-contrib/prometheus-emitter/src/main/resources/defaultMetrics.json
+++ b/extensions-contrib/prometheus-emitter/src/main/resources/defaultMetrics.json
@@ -42,7 +42,7 @@
   "ingest/events/unparseable" : { "dimensions" : ["dataSource"], "type" : "count", "help": "Number of events rejected because the events are unparseable." },
   "ingest/events/duplicate" : { "dimensions" : ["dataSource"], "type" : "count", "help": "Number of events rejected because the events are duplicated."},
   "ingest/events/processed" : { "dimensions" : ["dataSource"], "type" : "count", "help": "Number of events successfully processed per emission period." },
-  "ingest/events/messageGap" : { "dimensions" : ["dataSource"], "type" : "gauge", "help": "Time gap between the data time in event and current system time."},
+  "ingest/events/messageGap" : { "dimensions" : ["dataSource"], "type" : "gauge", "help": "Time gap in milliseconds between the latest ingested event timestamp and the current system timestamp of metrics emission."},
   "ingest/rows/output" : { "dimensions" : ["dataSource"], "type" : "count", "help": "Number of Druid rows persisted."},
   "ingest/persists/count" : { "dimensions" : ["dataSource"], "type" : "count", "help": "Number of times persist occurred." },
   "ingest/persists/time" : { "dimensions" : ["dataSource"], "type" : "timer", "conversionFactor": 1000.0, "help": "Seconds spent doing intermediate persist."},

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