Adding remote write configs for Mongodb Metrics

[anphn-mtt]

Description

Added Remote/Write Configs for Mongodb metrics:
List of Metrics are on following page:
https://github.com/influxdata/telegraf/tree/master/plugins/inputs/mongodb

Metrics follow following formart.

        ## mongodb_active_reads
        ## mongodb_active_writes
        ## mongodb_commands_per_sec
        ## mongodb_connections_current
        ## mongodb_db_stats_storage_size
        ## mongodb_deletes_per_sec
        ## mongodb_document_*
        ## mongodb_flushes_per_sec
        ## mongodb_getmores_per_sec
        ## mongodb_inserts_per_sec
        ## mongodb_net_*_bytes_count
        ## mongodb_open_connections
        ## mongodb_page_faults
        ## mongodb_percent_cache_dirty
        ## mongodb_percent_cache_used
        ## mongodb_queries_per_sec
        ## mongodb_queued_reads
        ## mongodb_queued_writes
        ## mongodb_repl_queries
        ## mongodb_repl_commands_per_sec
        ## mongodb_repl_deletes_per_sec
        ## mongodb_repl_getmores_per_sec
        ## mongodb_repl_inserts_per_sec
        ## mongodb_repl_oplog_window_sec
        ## mongodb_repl_queries_per_sec
        ## mongodb_repl_updates_per_sec
        ## mongodb_resident_megabytes
        ## mongodb_updates_per_sec
        ## mongodb_uptime_ns
        ## mongodb_vsize_megabytes
        ## mongodb_wtcache_bytes_read_into
 

---

Testing performed

• Redeploy fluentd and fluentd-events pods
• Confirm events, logs, and metrics are coming in

[pmalek-sumo]

Ditto as elsewhere:

#1748 (comment)

Thanks!

[pmalek-sumo]

Suggested change

regex: (?:mongodb_(active_(reads|writes)|commands_per_sec|connections_current|db_stats_storage_size|deletes_per_sec|document_.*|flushes_per_sec|getmores_per_sec|inserts_per_sec|net_.*_bytes_count|open_connections|page_faults|percent_cache_(dirty|used)|queries_per_sec|queued_(reads|writes)|repl_((commands|deletes|getmores|inserts|oplog|queries|updates)_per_sec)|queries)|resident_megabytes|updates_per_sec|uptime_ns|vsize_megabytes|wtcache_bytes_read_into))

regex: (?:mongodb_(active_(reads|writes)|commands_per_sec|connections_current|db_stats_storage_size|deletes_per_sec|document_.*|flushes_per_sec|getmores_per_sec|inserts_per_sec|net_.*_bytes_count|open_connections|page_faults|percent_cache_(dirty|used)|queries_per_sec|queued_(reads|writes)|repl_((commands|deletes|getmores|inserts|oplog|queries|updates)_per_sec|queries)|resident_megabytes|updates_per_sec|uptime_ns|vsize_megabytes|wtcache_bytes_read_into))

Without this change this is an invalid regex: