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Fix: Skip the non-exist namespaces when there are multiple mongo instance metrics to scrape

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Refer to this issue: #1144 Changes: 1. skip the non-exist namespaces when there are multiple mongo instance metrics to scrape 2. by the way the listAllCollections(ctx, client, collections, nil, true)...

The checkNamespacesForViews function implimentation works well as what I expected when there are mulitiple mongo instances. https://github.com/percona/mongodb_exporter/blob/ba39863aee6812fb89f5efda47ff446bff8827d1/exporter/common.go#L166 If there are multiple mongo instance uri was setted, and also multiple collections...

When want to access the /scrapeall path to get metrics from multiple mongo instance, the returned result carrys a instance lable among all the original labels . Something like this:...

feature: add extra virtual host style endpoints support

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This PR add the user custom endpoints that need to send request with virtual host style reference issues: #794 #518 Here I add a command line flag and also support...

Add extra virtual host style endpoinds support for s5cmd

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## Question Currently, s5cmd will use path style endpoint by default when sending request to remote object storage, only when the remote endpoints match the following two endpoints will send...