new metrics

[dbernstein1]

PMM-XXXX (optional, if ticket reported)

• [ ] Links to other linked pull requests (optional).

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• [ ] Tests passed.
• [ ] Fix conflicts with target branch.
• [ ] Update jira ticket description if needed.
• [ ] Attach screenshots/console output to confirm new behavior to jira ticket, if applicable.

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[it-percona-cla]

All committers have signed the CLA.

[BupycHuk]

Hi, @dbernstein1 thanks for the contribution. Could you provide information on what this PR is about and what problem you are fixing here? Thanks

[dbernstein1]

@BupycHuk

1. added the following metrics:

• collections with chunks currently being balanced among shards (mongodb_mongos_sharding_migrating)
• System balancer running on/off indictation (mongodb_mongos_sharding_balancer_running)
• chunk size in megabytes (mongodb_mongos_sharding_chunk_size_mb)

2. Included a label with the db/collection in mongodb_mongos_sharding_shard_chunks_total to see how chunks are balanced across shards in a given collection

3. Fixed a bug in balancerEnabled mongodb_mongos_sharding_balancer_enabled always returned 1 even when balanced was disabled

[BupycHuk]

@dbernstein1 please sign the CLA

[dbernstein1]

@BupycHuk I already did but it is showing up that I didn’t

[dbernstein1]

[artemgavrilov]

Hi @dbernstein1 your commits signed with [email protected] email address, but your GH account has different address. Because of that CLA check is not passing.

[BupycHuk]

@dbernstein1 please add the email address used for this commit to your account

[dbernstein1]

@BupycHuk I added [email protected] to my github account. Tried signing the CLA again

[artemgavrilov]

@dbernstein1 @BupycHuk CLA problem has gone.