dmsolr commented on issue #2730: Provide plugin for Solr-7.x(client) URL: https://github.com/apache/skywalking/pull/2730#issuecomment-497704069 Hi @wu-sheng , - common tags: 1. status : status of response. 2. qtime : solr - query tags 1. qt: Query Type - which Request Handler should handle the request. 2. numFound : the numer of SolrDocuments returned from a search. 3. db.statment: If it enable, span will trace the query parameters of query. (Default disable) - insert tags(/update/ADD) 1. docsSize: the number of committed documents. 2. commitWithin: the time horizon by which the document should be committed - delete tag(/update/DELETE_X) 1. delete.by : deletes a list of documents by doc_id. (or deletes documents base on query) - commit tags (/update/COMMIT) 1. softCommit : Performs an explicit commit, causing pending documents to be committed for indexing. - optimize tags (/update/OPTIMIZE) 1. maxOptimizeSegs : optimizes down to at most this number of segments On commit/optimize request，maybe need to trace waitFLush and waitSearch. They explain whether QTime is available. About `DB_INSTANCE`, for solr, to get this is expensive and useless.   
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