Refactor ILM collector

Consolidate the ILM collector logic into a single collector using the new Collector interface

Signed-off-by: Joe Adams <github@joeadams.io>

Author: sysadmind

CHANGELOG.md

@@ -3,20 +3,20 @@
 BREAKING CHANGES:
 
 The flag `--es.data_stream` has been renamed to `--collector.data-stream`.
+The flag `--es.ilm` has been renamed to `--collector.ilm`.
 
 * [CHANGE] Rename --es.data_stream to --collector.data-stream #983
+* [CHANGE] Rename --es.ilm to --collector.ilm #999
 
 ## 1.9.0 / 2025-02-27
 
 BREAKING CHANGES:
 
 The flag `--es.slm` has been renamed to `--collector.slm`.
-The flag `--es.ilm` has been renamed to `--collector.ilm`.
 
 The logging system has been replaced with log/slog from the stdlib. This change is being made across the prometheus ecosystem. The logging output has changed, but the messages and levels remain the same. The `ts` label for the timestamp has bewen replaced with `time`, the accuracy is less, and the timezone is not forced to UTC. The `caller` field has been replaced by the `source` field, which now includes the full path to the source file. The `level` field now exposes the log level in capital letters.
 
 * [CHANGE] Rename --es.slm to --collector.slm #932
-* [CHANGE] Rename --es.ilm to --collector.ilm #XXX
 * [CHANGE] Replace logging system #942
 * [ENHANCEMENT] Add external refresh stats #933
 

collector/ilm.go

@@ -34,7 +34,7 @@ var (
 
 	ilmStatus = prometheus.NewDesc(
 		prometheus.BuildFQName(namespace, "ilm", "status"),
-		"Current status of ilm. Status can be STOPPED, RUNNING, STOPPING.",
+		"Current status of ILM. Status can be STOPPED, RUNNING, STOPPING.",
 		[]string{"operation_mode"}, nil,
 	)
 )

collector/ilm_test.go

@@ -41,7 +41,7 @@ func TestILM(t *testing.T) {
 						# TYPE elasticsearch_ilm_index_status gauge
 						elasticsearch_ilm_index_status{action="",index="twitter",phase="",step=""} 0
 						elasticsearch_ilm_index_status{action="complete",index="facebook",phase="new",step="complete"} 1
-						# HELP elasticsearch_ilm_status Current status of ilm. Status can be STOPPED, RUNNING, STOPPING.
+						# HELP elasticsearch_ilm_status Current status of ILM. Status can be STOPPED, RUNNING, STOPPING.
             # TYPE elasticsearch_ilm_status gauge
             elasticsearch_ilm_status{operation_mode="RUNNING"} 1
             elasticsearch_ilm_status{operation_mode="STOPPED"} 0