metrics: rclone rc binding metrics endpoint

[hiddenmarten]

The associated forum post URL from https://forum.rclone.org

I don't have any, just wanted to create an issue to link my future PR with.

What is the problem you are having with rclone?

rclone rc trying to bind metrics endpoint if environment variable RCLONE_METRICS_ADDR is set

What is your rclone version (output from rclone version)

v1.68.2

Which OS you are using and how many bits (e.g. Windows 7, 64 bit)

Linux

Which cloud storage system are you using? (e.g. Google Drive)

Doesn't matter in that case.

The command you were trying to run (e.g. rclone copy /tmp remote:tmp)

RCLONE_METRICS_ADDR="0.0.0.0:9000" rclone rc -vv rc/noop

A log from the command with the -vv flag (e.g. output from rclone -vv copy /tmp remote:tmp)

NOTE: └──╼ $ RCLONE_METRICS_ADDR="0.0.0.0:9000" rclone rcd was run in advance.

└──╼ $ RCLONE_METRICS_ADDR="0.0.0.0:9000" rclone rc -vv rc/noop
2024/12/15 22:21:21 DEBUG : Setting  metrics_addr="0.0.0.0:9000" from environment variable RCLONE_METRICS_ADDR
2024/12/15 22:21:21 DEBUG : Setting --metrics-addr "0.0.0.0:9000" from environment variable RCLONE_METRICS_ADDR="0.0.0.0:9000"
2024/12/15 22:21:21 DEBUG : rclone: Version "v1.68.2" starting with parameters ["rclone" "rc" "-vv" "rc/noop"]
2024/12/15 22:21:21 CRITICAL: Failed to start metrics server: failed to init server: listen tcp 0.0.0.0:9000: bind: address already in use

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