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collector/textfile: Avoid inconsistent help-texts (#2962)
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>
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