Add a caution comment of scrape_interval (#4869)

* Add caution comment of scrape_interval

Signed-off-by: t-kikuc <tkikuchi07f@gmail.com>

* Remove concrete value

Signed-off-by: t-kikuc <tkikuchi07f@gmail.com>

* Fix to commit hash of v0.47.0 to fix the ref position

Signed-off-by: t-kikuc <tkikuchi07f@gmail.com>

---------

Signed-off-by: t-kikuc <tkikuchi07f@gmail.com>
Signed-off-by: khanhtc1202 <khanhtc1202@gmail.com>

manifests/pipecd/templates/configmap.yaml

@@ -200,6 +200,8 @@ data:
             replacement: $1
 
       - job_name: pipecd-ops
+        # This scrape_interval must not be larger than the interval of piped's stats-reporting.
+        # ref: https://github.com/pipe-cd/pipecd/blob/a73d0913643ef1da05bc8898cf055c9893f16e0b/pkg/app/piped/statsreporter/reporter.go#L53
         scrape_interval: 1m
         kubernetes_sd_configs:
           - role: endpoints