Collect tarantool/memcached statistics

[Totktonada]

tarantool/memcached provides <memcached instance>:info() method. As far I see from the code it returns the following fields as a Lua table (structure field name — value):

struct memcached_stat {     
        /* connection informations */
        unsigned int  curr_items;   
        unsigned int  total_items;
        unsigned int  curr_conns;
        unsigned int  total_conns;  
        uint64_t      bytes_read;             
        uint64_t      bytes_written;
        /* get statistics */
        uint64_t      cmd_get;
        uint64_t      get_hits;                                                                
        uint64_t      get_misses;
        /* delete stats */  
        uint64_t      cmd_delete;                                                              
        uint64_t      delete_hits;                                                             
        uint64_t      delete_misses;                                                           
        /* set statistics */
        uint64_t      cmd_set;
        uint64_t      cas_hits;
        uint64_t      cas_badval;     
        uint64_t      cas_misses;
        /* incr/decr stats */
        uint64_t      cmd_incr;                                                                
        uint64_t      incr_hits;
        uint64_t      incr_misses;                                                             
        uint64_t      cmd_decr;                                                                
        uint64_t      decr_hits;
        uint64_t      decr_misses;                                                             
        /* touch/flush stats */                                                                
        uint64_t      cmd_touch;                                                               
        uint64_t      touch_hits;                                                              
        uint64_t      touch_misses;                                                            
        uint64_t      cmd_flush;
        /* expiration stats */                                                                 
        uint64_t      evictions;                                                               
        uint64_t      reclaimed;                                                               
        /* authentication stats */                                                             
        uint64_t      auth_cmds; 
        uint64_t      auth_errors;                                                             
};

It would be good to collect this statistics periodically when a memcached instance works and report to some monitoring service or dashboard. To be honest, I don't know how to better integrate tarantool/memcached and tarantool/metrics, so I'll appreciate suggestions.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 30 days

[Totktonada]

If you want to close an issue, please, provide a reason. Doing that automatically is meaningless and unpleasant.

Moreover, you have less then hundred issues (open and closed) overall, since 2018. There is no problem to keep everything in a good shape.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 30 days

[Totktonada]

Let's continue produce useless messages and spam everyone who subscribed to the thread.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 30 days

[Totktonada]

No, it is actial whether there is activity or no activity.

[yngvar-antonsson]

This should be done in tarantool/memcached , not in tarantool/metrics . Closed.

[Totktonada]

Let's track it in tarantool/memcached#98 so.