Avoid metrics with inconsistent help-texts. The earlier behaviour has
been preserved in the sense that the first encountered instance is still
used to generate metrics, whereas the subsequent inconsistent ones are
ignored along with a few peripheral changes.
```
# HELP node_scrape_collector_duration_seconds node_exporter: Duration of a collector scrape.
#TYPE node_scrape_collector_duration_seconds gauge
node_scrape_collector_duration_seconds{collector="textfile"} 0.0004005
# HELP node_scrape_collector_success node_exporter: Whether a collector succeeded.
# TYPE node_scrape_collector_success gauge
node_scrape_collector_success{collector="textfile"} 1
# HELP node_textfile_mtime_seconds Unixtime mtime of textfiles successfully read.
# TYPE node_textfile_mtime_seconds gauge
node_textfile_mtime_seconds{file="/Users/rexagod/repositories/misc/node_exporter/ne-bar.prom"} 1.710812009e+09
node_textfile_mtime_seconds{file="/Users/rexagod/repositories/misc/node_exporter/ne-foo.prom"} 1.710811982e+09
# HELP node_textfile_scrape_error 1 if there was an error opening or reading a file, 0 otherwise
# TYPE node_textfile_scrape_error gauge
node_textfile_scrape_error 1
# HELP promhttp_metric_handler_errors_total Total number of internal errors encountered by the promhttp metric handler.
# TYPE promhttp_metric_handler_errors_total counter
promhttp_metric_handler_errors_total{cause="encoding"} 0
promhttp_metric_handler_errors_total{cause="gathering"} 0
# 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
# HELP tau_infrastructure_performing_maintenance_task At what timestamp a given task started or stopped, the last time it was run.
# TYPE tau_infrastructure_performing_maintenance_task gauge
tau_infrastructure_performing_maintenance_task{main_task="nightly",start_or_stop="start",sub_task="main"} 1.64728080198446e+09
```
Fixes: #2317
Signed-off-by: Pranshu Srivastava <rexagod@gmail.com>
The textfile collector will now provide a unified metric description
(that will look like "Metric read from file/a.prom, file/b.prom")
for metrics collected accross several text-files that don't already
have a description.
Also change the error handling in the textfile collector tests to
ContinueOnError to better mirror the real-life use-case.
Signed-off-by: Guillaume Espanel <guillaume.espanel.ext@ovhcloud.com>
Signed-off-by: Guillaume Espanel <guillaume.espanel.ext@ovhcloud.com>
* collector: Unwrap glob textfile directories
* collector: Store full path in mtime's file label
The point is to avoid duplicated gauges from files with the same name in
different directories.
This introduces support for exporting from multiple directories matching
given pattern (e.g. `/home/*/metrics/`).
Signed-off-by: Kiril Vladimirov <kiril@vladimiroff.org>
* remove injection hook for textfile metrics, convert them to prometheus format
* add support for summaries
* add support for histograms
* add logic for handling inconsistent labels within a metric family for counter, gauge, untyped
* change logic for parsing the metrics textfile
* fix logic to adding missing labels
* Export time and error metrics for textfiles
* Add tests for new textfile collector, fix found bugs
* refactor Update() to split into smaller functions
* remove parseTextFiles(), fix import issue
* add mtime metric directly to channel, fix handling of mtime during testing
* rename variables related to labels
* refactor: add default case, remove if guard for metrics, remove extra loop and slice
* refactor: remove extra loop iterating over metric families
* test: add test case for different metric type, fix found bug
* test: add test for metrics with inconsistent labels
* test: add test for histogram
* test: add test for histogram with extra dimension
* test: add test for summary
* test: add test for summary with extra dimension
* remove unnecessary creation of protobuf
* nit: remove extra blank line
