Add metrics for failed topic load operation

[codelipenghui]

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• I searched in the issues and found nothing similar.

Motivation

Currently, we have topic load-related metrics like the followings:

topic_load_times{cluster="standalone",quantile="0.5"} 140.0
topic_load_times{cluster="standalone",quantile="0.75"} 183.0
topic_load_times{cluster="standalone",quantile="0.95"} 249.0
topic_load_times{cluster="standalone",quantile="0.99"} 249.0
topic_load_times{cluster="standalone",quantile="0.999"} 249.0
topic_load_times{cluster="standalone",quantile="0.9999"} 249.0
topic_load_times_count{cluster="standalone"} 6.0
topic_load_times_sum{cluster="standalone"} 955.0
topic_load_times_created{cluster="standalone"} 1.671240308864E9

But we are not able to detect if there are topics that failed to load due to
zookeeper/bookkeeper problems.

It's better to add new metrics for the topic load failed operation so that users
can add alerts based on the metrics.

Solution

Add topic_load_failed_count metrics

Alternatives

No response

Anything else?

The metrics changes requires a proposal

Are you willing to submit a PR?

• I'm willing to submit a PR!

[tjiuming]

@codelipenghui Please assign to me

[tjiuming]

what a coincidence, I was considering add the metric when I was dealing a ticket

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[sunheyi6]

@tjiuming you can directly submit a pr.I took a look, but I don't know how to get the topic load failed situation

[tjiuming]

@shy-share #19236 The PR is pending reivew

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