Fix HaproxyBackendMaxActiveSession: look at current / limit (#413)

haproxy_backend_max_sessions is the maximum number of sessions ever encountered during the lifetime of the HAProxy process. That is, it will never go down until HAProxy is restarted, so the alert continues to fire even though the situation has cleared!

This doesn't make sense. Look at the currently active sessions instead.

add new alerts for elasticsearch rules.yml (#411)

This commit adds new Prometheus alert definitions to monitor indexing and query metrics in Elasticsearch clusters. These alerts are essential for detecting performance issues related to indexing and querying activities.

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Update rules.yml

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Update rules.yml

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