remote read/write API Twelve integrations for this API Ongoing work to send write-ahead-log over the wire to fill gaps Richard Hartmann & Frederic Branczyk @TwitchiH & @fredbrancz Prometheus Deep Dive there are object storage backends for Prometheus, e.g. Thanos Remote API can now send WAL over the wire to fill gaps in data There are twelve different systems which are able to ingest Proemtheus data this

些差异，可以使用 on 和 ignoring 关键字来限制用于做匹配的标签集。举例： mysql_slave_status_slave_sql_running == 0 and ON (instance) mysql_slave_status_master_server_id > 0 这个promql想表达的意思是如果这个mysql实例是个slave（master_server_id>0），则检查其 s slave_sql_running的值，如果slave_sql_running==0表示slave sql线程没有在运行。 但是mysql_slave_status_slave_sql_running和mysql_slave_status_master_server_id这两个 metric的标签可能并非完全一致，不过好在二者都有个instance标签，且相同instance标签的数 据从语义