[feature][doc] Add schema metrics doc (#14901)
[feature][doc] Add schema metrics doc (#14901)


merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,massakam/pulsar,massakam/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,massakam/pulsar,massakam/pulsar,yahoo/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar